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San Diego - List of Stone Quarries, Etc.*

(* Please note this list does not include sand, gravel, or decomposed granite quarries.)

Escondido (south of), San Diego County, California – the Bernardo Quarries (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963, pp. 262. (This book is available on the Internet Archive – Texts.)

(Map No.) (blank); (Name of claim, mine, or group) Bernardo quarries; (Location) South of Escondido; (Owner name, address) (blank); (Geology) (blank).

(Remarks and references) “See Van Deventer and Bly Stone Co. quarries, which are described individually. (Hoppin and Norman 50:4,7; Tucker 25:363-64; Tucker and Reed 39: pl.1).” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)
- Escondido (south of), San Diego County, California – the Bly Stone Company Quarry (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963. (This book is available on the Internet Archive – Texts.)
  
  (pp. 261)
  “Bernardo Area (Black Granite). The site of the settlement of Bernardo is near the point where the north shore of Lake Hodges intersects U.S. Highway 395, about 4 ½ miles south of Escondido City Hall. The two quarries in the area were worked for dark gray gabbro in the 1920’s. Only one of these could be located during the present investigation: this was the quarry of the Bly Stone Company which was worked from 1921 to 1924. The other quarry, that of W. E. Vandeventer, was worked from 1921 to 1925.”
  (pp. 262)
  
  (Map No.)* 416; (Name of claim, mine, or group) Bly Stone Co. quarry; (Location) Center of sec. 10, T11S, R2W, SBM (proj.); about 4 ½ miles south of Escondido, and 3/8 of a mile west of U.S. Highway 395; (Owner name, address) Undetermined (1958) Bly Stone Co., Los Angeles (1924); (Geology) Large residual boulders of dark-gray granitic rocks (San Marcos gabbro.). (* You can find the location of this quarry on Plate 10 near the end of the book at the link above. This map covers the Lakeside-Foster, the Escondido, and Vista areas of San Diego County.)
  
  (Remarks and references) “Operated from 1921 to 1924 Small quarry. Known also as one of the two Bernardo quarries. Other is Van Deventer, which see. (Hoppin and Norman 50:4, 6, 7.” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)
Escondido, San Diego County, California – the Black Diamond Quarry (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963, pp. 262. (This book is available on the Internet Archive – Texts.)

(Remarks and references) “See Escondido Quarries, Inc. in text. (Tucker and Reed 39:43).” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)
Escondido (south of), Bernardo District, San Diego County, California – Bly Stone Company Quarry (Granite) (From Commercial ‘Black Granite’ of San Diego County, California, Special Report 3, by Richard A. Hoppin and L. A. Norman, Jr., State of California, Department of Natural Resources, Division of Mines, San Francisco, December 1950.)

No. 2 on “Figure 1. Index map of San Diego County granite quarries,” located in the Bernardo District of San Diego County, produced a black stone. First year of production was 1921, last year of production was 1924.
Escondido, Bernardo District, San Diego County, California – the Daley Corporation – Daley Corporation Quarry (Granite) (From Commercial 'Black Granite' of San Diego County, California, Special Report 3, by Richard A. Hoppin and L. A. Norman, Jr., State of California, Department of Natural Resources, Division of Mines, San Francisco, December 1950.")
Figure 1. Index map of San Diego County granite quarries" No. 6 on "Figure 1. Index map of San Diego County granite quarries," located in the Bernardo District of San Diego County, produced a black stone" First year of production was 1923, last year of production was 1923.
- Escondido, San Diego County, California – the Daley Corporation (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963, pp. 263. (This book is available on the Internet Archive – Texts.)
  
  (Remarks and references) “See Van Deventer quarry. (Hoppin and Norman 50:4,7).” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)
Escondido District, San Diego County, California – Ebony Black Diamond Granite Company Granite Quarry (Granite) (From Commercial 'Black Granite' of San Diego County, California, Special Report 3, by Richard A. Hoppin and L. A. Norman, Jr., State of California, Department of Natural Resources, Division of Mines, San Francisco, December 1950.")
No. 7 on "Figure 1. Index map of San Diego County granite quarries," located in the Escondido District of San Diego County, produced a black stone, trade name "Ebony Black granite." First year of production was 1923, last year of production was 1936.
- Escondido (north-northeast of), San Diego County, California – the Ebony Black Diamond Granite Co. Quarry (Stockdale Granite quarry) (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963, pp. 263. (This book is available on the Internet Archive – Texts.)
  
  (Map No.)* 420; (Name of claim, mine, or group) Ebony Black Diamond Granite Co. (Stockdale Granite quarry); (Location) Near center of the W ½ sec. 30, T12S, R3W, SBM; about 3 miles west-southwest of Escondido, near Harmony Grove. A few hundred ft. north-northeast of the Valley Granite Co. quarry;* (Owner name, address) Undetermined (1958) W. M. Hike, Escondido (1939); (Geology) Dark-gray granitic rocks (San Marcos gabbro) which comprise large residual boulders. (* You can find the location of this quarry on Plate 10 near the end of the book at the link above. This map covers the Lakeside-Foster, the Escondido, and Vista areas of San Diego County.)
  
  (Remarks and references) “See text. (Goldman 57:595; Hoppin and Norman 50:4, 7, 8, 9, 11; Tucker and Reed 39:43).”
Escondido Area, San Diego County, California – Emil Johnson and Sons or Emil Johnson Brothers or Johnson Brothers Quarries (Granite)
See:
- “Escondido, San Diego County, California – National Quarries (AKA Emil Johnson and Sons, Emil Johnson Brothers) (Granite)”
- “Pala District, San Diego County, California – Emil Johnson and Sons (National Quarries) (Granite Quarry)”
- “Vista District, San Diego County, California – Emil Johnson and Sons (Granite Quarry)”

Escondido, San Diego County, California – the Escondido Granite Company (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963. (Used with permission) (This book is available on the Internet Archive – Texts.)

“Photo 80. Cutting a block of black granite into slabs with gang saw at Escondido Quarries, Inc. operation of Pacific Cut Stone Co. Photo by Mary Hill.” (pp. 257)

“Photo 80. Cutting a block of black granite into slabs with gang saw at Escondido Quarries, Inc. operation of Pacific Cut Stone Co., San Diego Co., CA

“Photo 81...Polishing slab of black granite at Escondido Quarries, Inc. operation of Pacific Cut Stone Co. Photo by Mary Hill.” (pp. 257)

“Photo 81...Polishing slab of black granite at Escondido Quarries, Inc. operation of Pacific Cut Stone Co., San Diego Co., CA

“In mid-1958, four companies were both quarrying and finishing granite in the county for use as dimension stone: Pacific Cut Stone Company, Alhambra (Escondido Quarries, Inc.); Allied Granite Company, Los Angeles, Pomona Granite Company, Pomona; and Valley Granite Company, Escondido. The National ‘Quarries, Inc., Escondido, was producing only unfinished stone. Five companies were finishing stone only: California Wire Sawyer Corporation, Lakeside; Clemens Granite Company, El Cajon; Escondido Granite Company, Escondido, Pyramid Granite Company, Escondido; and Southern California Granite Company, San Diego.”

(pp. 259)

“Escondido Area (Black Granite). Seven quarries are clustered in an area of slightly more than one quarter square mile which is about 3 ½ miles southwest of Escondido. The quarries are on the north and south slopes of a short, narrow canyon which cuts a narrow, north-trending hill composed of San Marcos gabbro. The deposits quarried in the area consist of large residual boulders of fine- to medium-grained, dark gray to dark bluish-gray gabbro (Photo 82). Stone from these deposits is used for building, monuments, and surface plates.

“The first quarry in the area was opened by John Stridsberg who worked this, and later one other quarry, from 1923 until his death in 1952. Three quarries were active in mid-1958. One of these was the largest granite quarry in the county, which was being operated by Escondido Quarries, Inc. (see description below). The other two active quarries were being worked by the Valley Granite Company.”

“Photo 82. Escondido-Quarries, Inc., Harmony Grove. Residual boulders of gabbro (black granite) are blasted, then worked downward toward quarry floor which is west (left) of area photographed. Boulders are as large as 25 feet in diameter. Photo by Mary Hill.” (pp. 259)

(pp. 263)

(Map No.)* 421; (Name of claim, mine, or group) Escondido Quarries, Inc. (Pacific Cut Stone and Granite Co.); (Location) Near Harmony Grove, southwest of Escondido;* (Owner name, address) (blank) (Geology) (blank). (* You can find the location of this quarry on Plate 10 near the end of the book at the link above. This map covers the Lakeside-Foster, the Escondido, and Vista areas of San Diego County.)
(Remarks and references) “See text. (Goldman 57:595; Hoppin and Norman 50:4, 7 8, 9, 11; Tucker and Reed 39:43).” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)

Escondido, San Diego County, California – the Escondido Quarries, Inc. (Pacific Cut Stone and Granite Co.) Quarry (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963, pp. 263. (This book is available on the Internet Archive – Texts.)

(Map No.)* 421; (Name of claim, mine, or group) Escondido Quarries, Inc. (Pacific Cut Stone and Granite Co.); (Location) Near Harmony Grove, southwest of Escondido;* (Owner name, address) (blank) (Geology) (blank). (* You can find the location of this quarry on Plate 10 near the end of the book at the link above. This map covers the Lakeside-Foster, the Escondido, and Vista areas of San Diego County.)

(Remarks and references) “See text. (Goldman 57:595; Hoppin and Norman 50:4, 7 8, 9, 11; Tucker and Reed 39:43).” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)

Escondido, San Diego County, California – National Quarries (Granite) (Excerpt from "California Mineral Commodities in 1951," California State Division of Mines, California Journal of Mines and Geology, pp. Vol. 50, No. 1, January 1954, pp. 59-147. Used with permission, California Department of Conservation, California Geological Survey.)

(Operator) National Quarries; (Address) 923 Park Hill Dr., Escondido; (Location) Escondido.

Escondido Area, San Diego County, California – Emil Johnson and Sons (National Quarries) (Granite Quarry) (From Commercial ‘Black Granite’ of San Diego County, California, Special Report 3, by Richard A. Hoppin and L. A. Norman, Jr., State of California, Department of Natural Resources, Division of Mines, San Francisco, December 1950.”)

No. 9 on “Figure 1. Index map of San Diego County granite quarries,” located in the San Marcos District of San Diego County, produced a black stone, trade name “National Blue granite.” First year of production was 1946, last year of production was 1948.

Escondido Region, San Diego County, California – National Quarries (Emil Johnson Brothers) (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963. (This book is available on the Internet Archive – Texts.)

(pp. 232)

“Gabbroic Rocks. National Quarries, Inc., Escondido, has sold some dark bluish-gray gabbro for use as decorative stone (see description in text under ‘Dimension Stone’). Three deposits of orbicular gabbro in the county might also be considered as possible sources of decorative stone (see section on ‘Orbicular Gabbro’). Roofing granules have been a byproduct of the Escondido Quarries operation near Harmony Grove.”

(pp. 247)

(Map No.) 398; (Company and Operations – or Deposit) National Quarries Inc.; (Location) Escondido area; (Status) (Blank ?); (History) (Blank ?); (Geology) (Blank ?); (Size of Excavation) (Blank ?); (Products) Broken stone for use as decorative stone and riprap.

(Mining, Processing, References, and Other Data) “A leading producer of dimension stone (under which described); also produces some ‘black granite’ for use as decorative stone; and has sold moderate tonnages of black granite for use as riprap in sea front projects at Camp Pendleton.”

(pp. 255)

“About 37 granite quarries have been opened in the county since 1888. In 1958, five companies were working a total of eight of these quarries. The oldest and longest continuously operated granite-producing company in the county was the Simpson-Pirnie Granite Company which was active from 1888 to 1932. The most productive companies in 1958 were Escondido Quarries, Inc. and National Quarries, Inc. (see descriptions below).”

“The light-colored (gray) varieties of commercial granite are produced from pale gray quartz diorite and granodiorite, which compose a large part of the batholith of Southern California. In mid-1958 gray granite was quarried from only one locality; the National Quarries quarry at Foster (Lakeside-Foster-Santee area), near which are many inactive quarries (Photo 79)….”

“Photo 78...Residual boulders of gabbro (black granite) in weathered gabbro at locality near Vista. Photo by Mary Hill.” (pp. 256)

“Photo 79...Foster area. View southwest toward California Wire Sawyer Corporation which is a producer of surface plates from granite quarried by National Quarries at deposit shown at left edge of photo and from other deposits. Surface plates are used to calibrate delicate instruments. Old Cameron-Deering quarry is at right.” (pp. 256)

(pp. 258)

“In mid-1958, four companies were both quarrying and finishing granite in the county for use as dimension stone: Pacific Cut Stone Company, Alhambra (Escondido Quarries, Inc.); Allied Granite Company, Los Angeles, Pomona Granite Company, Pomona; and Valley Granite Company, Escondido. The National ‘Quarries, Inc., Escondido, was producing only unfinished stone. Five companies were finishing stone only: California Wire Sawyer Corporation, Lakeside; Clemens Granite Company, El Cajon; Escondido Granite Company, Escondido, Pyramid Granite Company, Escondido; and Southern California Granite Company, San Diego.”

(pp. 260)
“Since 1955 a new quarry has been operated near Foster by National quarries. This company sells stone to California Wire Sawyer Corporation which since 1955 has operated a finishing plant adjacent to the quarry (Photo 79).”
(pp. 261)

National Quarries (Johnson Brothers)

“Location: Escondido region. The locations of the deposits worked by the company are described below. Ownership: Johnson Brothers, 923 Park Hill Drive, Escondido (1958).

“National Quarries has quarried granite in San Diego County since 1945, and now ranks second in the county in granite production. The company markets only unfinished stone, which is sold wholesale to finishers: especially to (1) California Wire Sawyer Corporation, Lakeside, which produces surface plates; and (2) Pyramid Granite Co, Escondido, which produces monument stone and surface plates. The unfinished stone also is shipped to Los Angeles and as far east as Minnesota. A small proportion of stone quarried by the company is marketed as riprap and as decorative (ornamental) stone.

“In mid-1958 National quarries was operating two quarries and producing stone that ranged in color from ‘black,’ through ‘blue,’ to ‘Lakeside Gray.’ Black to blue stone was being obtained from the Vista Black (California Cut Stone Co.) Quarry which is about three miles due east of Vista (see description in accompanying tabulated list). Lakeside Gray stone was being produced at a quarry opened in 1955 adjacent to the finishing plant of the California Wire Sawyer Corporation at Foster, in the center of the SE. ¼ SE. ¼ Sec 35, T. 14 S., R. 1 W., S.B.M. In addition to these quarries, National Quarries had an option to lease the Texas Quarries in Gopher Canyon, about four miles east-northeast of Vista (see description in tabulated list).
“National Quarries also has worked the following quarries in the county (see descriptions in accompanying tabulated list): (1) National Blue Granite quarry, in Gopher Canyon, 4 miles northeast of Vista, operated 1946-1952; (2) Magee quarry, 3 ¼ miles east-northeast of Pala, operated 1946-1957; and (3) Matson quarry, in Gopher Canyon, 4 miles east of Vista, operated 1952-1957.”
(pp. 265)

(Remarks and references) “See text. (Hoppin and Norman 50:4, 7, 8, 11, 13, 14, 15)” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)

San Diego County, California – National Quarries (Stone) (active ca 1996) (From Mines and Mineral Producers Active in California (1994-1995), Special Publication 103 (Revised 1996), California Department of Conservation, Division of Mines and Geology, in cooperation with California Department of Conservation, Office of Mine Reclamation. Used with permission, California Department of Conservation, California Geological Survey.)

Mine name: National Quarries; Operator: National Quarries; Address & County: P. O. Box 1330, Perris, CA 92572, San Diego County; Phone: (619) 726-6248; Latitude: 33.23, Longitude: -117.02, and Mine location number: Map No. 630; Mineral commodity: Stone.
Escondido Area, San Diego County, California – National Quarries Granite Quarry. (from United States Geological Survey, “Mineral Industries Surveys – Directory of Principal Dimension Stone Producers in the United States in 1995,” prepared in January 1997.)

In 1995 National Quarries was operating one granite quarry in San Diego County. At that time the headquarters for the company was Perris, California.
Escondido Area, San Diego County, California – National Quarries (excerpt from “Re-emerging U.S. Stone Market: New plan for a 60-year-old quarry,” by Jennifer Adams, September 18, 2001, on the Stone World web site.

Quarrying the blocks

“National Quarries’ operation is situated on a 210-acre site, according to Fletcher, adding that there are five small quarries on the property. ‘In one quarry, we are about 60 feet (from) top to bottom, and it runs 80 x 80 feet (in area),’ he said. ‘We have only the one quarry site in San Marcos producing Imperial Blue and Palomar Black (granite). We quarry our Yosemite White in Madera, CA, and we get our Bear Mountain Red from Fredericksburg, TX, through Cold Spring – from the sale of that quarry from National Quarries to Cold Spring Granite Co. Cold Spring calls this stone Radiant Red.’”
Escondido Area, San Diego County, California – National Quarries (Granite) (excerpts from State Mining and Geology Board, Executive Office’s Report (pdf), Agenda Item No. 6: Acceptance of Special Report 191, Mineral Land Classification of National Quarries’ Twin Oaks Valley Road Site, San Marcos, San Diego County, California, for Construction Aggregate Resources, For Meeting Date: February 9, 2006

Background:

“On behalf of National Quarries (Petitioner), EnviroMine, Inc. submitted a petition to the SMGB, dated June 16, 2005, for mineral land classification of the National Quarries rock quarry located approximately 4 miles east of Vista in San Diego County. The State Geologist recommended approval of the Petition, and at the SMGB’s regular business meeting on September 22, 2005, the Petition was approved.

“National Quarries owns the property, which has been commercially mined since 1940. The property encompasses six irregularly shaped parcels of land totaling 210.9 acres. Although mostly mined for dimension stone, current operations extract construction aggregates, decomposed granite, boulders, rip-rap, and dimension stone.”
Twin Oaks Valley, San Diego County, California – National Quarries – “Quarry’s saws fall silent: County supervisors’ restriction on truck traffic cited,” by Linda Lou, March 16, 2006, on the San Diego Union Tribune web site.
Escondido Area, San Diego County, California – National Quarries, Inc. – “County, quarry in a rock-solid standoff: Owner sues, seeking to use saws, trucks,” by Linda Lou, May 17, 2006, on the San Diego Union Tribune web site.
Escondido Area, San Diego County, California – National Quarries, Inc. – “Suit to limit quarry mining dismissed: Residents’ complaints about truck traffic prompted case,” by J. Harry Jones, Staff Writer, May 18, 2007, on the San Diego Union Tribune web site.
Escondido Area, San Diego County, California – National Quarries (book)

Mineral Land Classification of National Quarries Twin Oaks Valley Road Site, San Marcos, San Diego County, California: For Construction Aggregate Resources, Vol. 191 of Special Report, by Lawrence L. Busch, California Geological Survey, 2006, 36 pp.
Escondido Area, San Diego County, California – National Quarries, LLC (present-day company / quarry: dimension stone and aggregate), 28474 N Twin Oaks Valley Road, San Marcos, CA
(760) 726-6246

Escondido District, San Diego County, California – Pacific Cut Stone and Granite Company (Granite) (From Commercial 'Black Granite' of San Diego County, California, Special Report 3, by Richard A. Hoppin and L. A. Norman, Jr., State of California, Department of Natural Resources, Division of Mines, San Francisco, December 1950.")

No. 15 on "Figure 1. Index map of San Diego County granite quarries," located in the Escondido District of San Diego County, produced a black stone, trade name "Black Diamond Granite." First year of production was 1936, last year of production was 1948.

Figure 3. Gang saw with partly completed cuts in black granite boulder. Pacific Cut Stone and Granite Company quarry, Escondido.

Figure 4. View of quarry with residual boulders in place and stockpiles for gang saw processing. Sawed slabs in foreground. Pacific Cut Stone and Granite Company quarry, Escondido.

Escondido, San Diego County, California – Pacific Cut Stone & Granite Co. (Granite) (Excerpt from "California Mineral Commodities in 1951," California State Division of Mines, California Journal of Mines and Geology, pp. Vol. 50, No. 1, January 1954, pp. 59-147. Used with permission, California Department of Conservation, California Geological Survey.)

(Operator) Pacific Cut Stone & Granite Co.; (Address) 414 S. Marengo Ave., Alhambra; (Location) Escondido.
Escondido, San Diego County, California – the Pacific Cut Stone and Granite Company Quarry (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963. (This book is available on the Internet Archive – Texts.)

(pp. 261)

“Grossmont – La Mesa Area (Gray Granite). Two quarries were operated during the early 1900’s in the La Mesa – Grossmont area: These are the Charles Moore Quarry which was operated from 1908 to 1913 and the Pacific Electric Company Quarry which was operated during the 1910’s. Output from the latter operation was used only as paving blocks.”

(pp. 265)

(Map No.)* (blank); (Name of claim, mine, or group) Pacific Electric Railway Co.; (Location) “South of Grossmont Station” (Merrill, 1914);* (Owner name, address) E. Fletcher (1914); (Geology) Gray granitic rocks. (* You can find the location of this quarry on Plate 10 near the end of the book at the link above. This map covers the Lakeside-Foster, the Escondido, and Vista areas of San Diego County.)
(Remarks and references) “Small quarry operated in 1910’s for stone used as paving blocks. (Merrill 14:673.” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)

Escondido, San Diego County, California – the Pacific Electric Railway Company Quarry (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963, pp. 265. (This book is available on the Internet Archive – Texts.)

(Map No.)* (blank); (Name of claim, mine, or group) Pacific Electric Railway Co.; (Location) “South of Grossmont Station” (Merrill, 1914);* (Owner name, address) E. Fletcher (1914); (Geology) Gray granitic rocks. (* You can find the location of this quarry on Plate 10 near the end of the book at the link above. This map covers the Lakeside-Foster, the Escondido, and Vista areas of San Diego County.)

(Remarks and references) “Small quarry operated in 1910’s for stone used as paving blocks. (Merrill 14:673.” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)
Escondido (southwest of), San Diego County, California – the Don Potts Quarry (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963, pp. 265. (This book is available on the Internet Archive – Texts.)

(Map No.)* 433; (Name of claim, mine, or group) Potts, Don, quarry; (Location) E ½ SW ¼ SE ¼ sec. 30, T12S, R2W, SBM; about 3 ½ miles southwest of Escondido, near Harmony Grove;* (Owner name, address) Don Potts, Escondido (1958); (Geology) Dark-gray granitic rocks (San Marcos gabbro). (* You can find the location of this quarry on Plate 10 near the end of the book at the link above. This map covers the Lakeside-Foster, the Escondido, and Vista areas of San Diego County.)

(Remarks and references) “Quarry opened on side of hill south of Harmony Grove road. Small production.” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)
Escondido, San Diego County, California – the Pyramid Granite Company Finishing Plant / Works (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963. (This book is available on the Internet Archive – Texts.)

(pp. 258)

“In mid-1958, four companies were both quarrying and finishing granite in the county for use as dimension stone: Pacific Cut Stone Company, Alhambra (Escondido Quarries, Inc.); Allied Granite Company, Los Angeles, Pomona Granite Company, Pomona; and Valley Granite Company, Escondido. The National ‘Quarries, Inc., Escondido, was producing only unfinished stone. Five companies were finishing stone only: California Wire Sawyer Corporation, Lakeside; Clemens Granite Company, El Cajon; Escondido Granite Company, Escondido, Pyramid Granite Company, Escondido; and Southern California Granite Company, San Diego.”

(pp. 265)

(Map No.)* (blank); (Name of claim, mine, or group) Pyramid Granite Co.; (Location) Escondido;* (Owner name, address) Pyramid Granite Co., Escondido; (Geology) (blank). (* You can find the location of this quarry on Plate 10 near the end of the book at the link above. This map covers the Lakeside-Foster, the Escondido, and Vista areas of San Diego County.)
(Remarks and references) “Finishes stone only Purchases unfinished stone from National Quarries, which see in text.” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)
Escondido District, San Diego County, California – the Stockdale Granite Quarry (F. W. Stockdale) (Granite) (See Ebony Black Diamond Granite Company.) (From Commercial 'Black Granite' of San Diego County, California, Special Report 3, by Richard A. Hoppin and L. A. Norman, Jr., State of California, Department of Natural Resources, Division of Mines, San Francisco, December 1950.")

No. 7 on "Figure 1. Index map of San Diego County granite quarries," located in the Escondido District of San Diego County, produced a black stone. First year of production was 1924, last year of production was 1924.
- Escondido, San Diego County, California – the F. W. Stockdale Granite Quarry (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963, pp. 266. (This book is available on the Internet Archive – Texts.)
  
  (Remarks and references) “See Ebony Black Diamond Granite Co. quarry. (Hoppin and Norman 50:7; Tucker 25:368-369; Tucker and Reed 39: pl. 1).” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)
Escondido District, San Diego County, California – John Stridsburg Granite Quarry (Granite) (From Commercial 'Black Granite' of San Diego County, California, Special Report 3, by Richard A. Hoppin and L. A. Norman, Jr., State of California, Department of Natural Resources, Division of Mines, San Francisco, December 1950.")

No. 19 on "Figure 1. Index map of San Diego County granite quarries," located in the Escondido District of San Diego County. The trade name was formerly "Superior Black granite" and the present trade name (circa 1950) was "Crystal Black Granite."
- Escondido, San Diego County, California – John Striburg (Granite) (Excerpt from "California Mineral Commodities in 1951," California State Division of Mines, California Journal of Mines and Geology, pp. Vol. 50, No. 1, January 1954, pp. 59-147. Used with permission, California Department of Conservation, California Geological Survey.)
  
  (Operator) John Striburg (deceased); (Address) Box 115, Escondido; (Location) Escondido.
Escondido District, San Diego County, California – Valley Granite Company - Granite Quarry (Granite) (From Commercial 'Black Granite' of San Diego County, California, Special Report 3, by Richard A. Hoppin and L. A. Norman, Jr., State of California, Department of Natural Resources, Division of Mines, San Francisco, December 1950.")
No. 21 on "Figure 1. Index map of San Diego County granite quarries," located in the Escondido District of San Diego County, produced a black stone, trade name "Escondido Black granite." First year of production was 1944, last year of production was 1948.
- Escondido, San Diego County, California – Valley Granite Co. (Granite) (Excerpt from "California Mineral Commodities in 1951," California State Division of Mines, California Journal of Mines and Geology, pp. Vol. 50, No. 1, January 1954, pp. 59-147. Used with permission, California Department of Conservation, California Geological Survey.)
  
  (Operator) Valley Granite Co.; (Address) 243 E. Fifth St., Escondido; (Location) Escondido.
- Escondido, San Diego County, California – Valley Granite Company (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963. (Used with permission.) (This book is available on the Internet Archive – Texts.)
  
  (pp. 258)
  
  “In mid-1958, four companies were both quarrying and finishing granite in the county for use as dimension stone: Pacific Cut Stone Company, Alhambra (Escondido Quarries, Inc.); Allied Granite Company, Los Angeles, Pomona Granite Company, Pomona; and Valley Granite Company, Escondido. The National ‘Quarries, Inc., Escondido, was producing only unfinished stone. Five companies were finishing stone only: California Wire Sawyer Corporation, Lakeside; Clemens Granite Company, El Cajon; Escondido Granite Company, Escondido, Pyramid Granite Company, Escondido; and Southern California Granite Company, San Diego.”
  
  (pp. 259)
  
  “Escondido Area (Black Granite). Seven quarries are clustered in an area of slightly more than one quarter square mile which is about 3 ½ miles southwest of Escondido. The quarries are on the north and south slopes of a short, narrow canyon which cuts a narrow, north-trending hill composed of San Marcos gabbro. The deposits quarried in the area consist of large residual boulders of fine- to medium-grained, dark gray to dark bluish-gray gabbro (Photo 82). Stone from these deposits is used for building, monuments, and surface plates.
  
  “The first quarry in the area was opened by John Stridsberg who worked this, and later one other quarry, from 1923 until his death in 1952. Three quarries were active in mid-1958. One of these was the largest granite quarry in the county, which was being operated by Escondido Quarries, Inc. (see description below). The other two active quarries were being worked by the Valley Granite Company.”
Escondido (south of), Bernardo District, San Diego County, California – W. E. Van Deventer Quarry (Granite) (From Commercial 'Black Granite' of San Diego County, California, Special Report 3, by Richard A. Hoppin and L. A. Norman, Jr., State of California, Department of Natural Resources, Division of Mines, San Francisco, December 1950.")

No. 6 on “Figure 1. Index map of San Diego County granite quarries,” located in the Bernardo District of San Diego County, produced a black stone. First year of production was 1921, last year of production was 1925.
- Escondido (south of), San Diego County, California – the W. E. Van Deventer (Daley Corporation) Quarry (Granite/dimension stone) (from Geology and Mineral Resources of San Diego County, County Report 3, by F. Harold Weber, Jr., Geologist, California Division of Mines and Geology, 1963. (This book is available on the Internet Archive – Texts.)
  
  (pp. 261)
  “Bernardo Area (Black Granite). The site of the settlement of Bernardo is near the point where the north shore of Lake Hodges intersects U.S. Highway 395, about 4 ½ miles south of Escondido City Hall. The two quarries in the area were worked for dark gray gabbro in the 1920’s. Only one of these could be located during the present investigation: this was the quarry of the Bly Stone Company which was worked from 1921 to 1924. The other quarry, that of W. E. Vandeventer, was worked from 1921 to 1925.”
  (pp. 267)
  
  (Map No.)* (blank); (Name of claim, mine, or group) (W. E.) Van Deventer (Daley Corporation) quarry; (Location) Sec. 10 (?), T13S, R2W, SBM (proj.); about 4 to 5 miles south of Escondido. (Exact location undetermined).;* (Owner name, address) Undetermined (1957); (Geology) Dark gray (”black”) granitic rocks (San Marcos gabbro). (* You can find the location of this quarry on Plate 10 near the end of the book at the link above. This map covers the Lakeside-Foster, the Escondido, and Vista areas of San Diego County.)
  
  (Remarks and references) “Known also as one of the two Bernardo quarries (other is Bly Stone Co. which see also). Reported by Tucker (1925) to be on south shore of Lake Hodges but could not be located by present writer in 1957. Operated from 1921 to 1925, mainly by Van Deventer. Daley Corporation produced some stone from this quarry in 1923. (Hoppin and Norman 50:4, 7; Tucker 25:363-364.” (To see the bibliography that lists the books cited in the previous sentence, see the “Annotated Bibliographies” section of Geology and Mineral Resources of San Diego County, pp. 283-309.)

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