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Mack Mine (John Mac mine; Mac mine; San Luis Rey claim), Rincon Mountain, Rincon, Rincon Mining District, San Diego Co., California, USAi
Regional Level Types
Mack Mine (John Mac mine; Mac mine; San Luis Rey claim)Mine
Rincon MountainMountain
Rincon- not defined -
Rincon Mining DistrictMining District
San Diego Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
33° 16' 16'' North , 116° 56' 35'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Valley Center9,277 (2011)10.3km
Hidden Trails750 (2008)16.4km
Hidden Meadows3,485 (2011)16.6km
San Pasqual2,041 (2018)20.0km
Aguanga1,128 (2011)20.4km


On the beryl-rimmed rebecs of Ruby
Brought fresh from the hyaline streams,
She played on the banks of the Yuba
Such songs as she heard in her dreams.
—Thomas Holley Chivers (1807–1858), Lily Adair

Summary:
The Mack mine is located in the SW4SW4 Sec. 25, T10S, R1W, SBM. The main workings are situated low on a hill slope east of the San Luis Rey River Valley, approximately 1.5 miles (2.4 km) south-southeast of Rincon, at an elevation of approximately 925' AMSL. The deposit was first described as 5 to 6 feet wide pegmatite dike with granite footwall and diorite hanging wall. The chief product was gem quality beryl of various colors, some of it deep blue. Small blue crystals of spinel which may be gahnite have also been reported.

Workings & Production:
The deposit was one of the earliest sources of gem quality beryl in San Diego County, and was discovered in November of 1903 by John M. Mack[1] and local Indian J. Calac[2]. Mack and Calac worked the deposit for several years, but would not disclose the exact quantity of production, or provide detailed information regarding the number of specimens or cut stones sold.

In 1905, George Kunz reported several pounds of opaque deep blue beryl extracted, as well as several fine gem beryls, found in several colors including yellow, green, and deep blue. Kunz reported that many fine gems were cut from the clear crystals, with clouded ones cut as cabochons that displayed a pleasing cat's-eye effect. The mine was developed by 3 open cuts, the largest measuring 61 feet long, 32 feet wide, and 16 feet deep. The mine workings were located on both walls of a small arroyo, a few hundred feet northwest of the ranch house. By 1951, these workings were reported as slightly caved and overgrown with chaparral, while the dumps in the arroyo bottom had been mostly removed by flash floods.

The Mack pegmatite dike strikes north 15 degrees west, and dips about 40 degrees southwest. The vein is exposed continuously along strike for about 170 feet, and discontinuously to the south-southwest for 120 feet. The dike is about 2 feet thick for most of its length, and its maximum thickness is 3.25 feet. The pocket pegmatite comprises the lower 4 to 6 inches of the quartz-perthite pegmatite core, and the upper 6 inches of the underlying line rock.

The core zone contains numerous vugs which are lined with euhedral crystals of muscovite, albite, quartz, beryl, and garnet. The beryl crystals are greenish blue to blue, and measure up to 13mm in diameter.

By 1951, the Mack mine and the Calac ranch were reported to be privately owned by Charles W. Hall of Valley Center. Around this time, Frederick J. Rynerson reported that the "John Mac Mine" had produced more beryls than any other pegmatite mines in the region that he knew of, taking into considering the amount of work done developing the deposit.

Footnotes:
1.Macedonio Llora Merrion Machado, "Mac" (1857-1942), was born on the old Machado family homestead in Los Angeles County. Mac attended Santa Clara College and Heald's Business College in Los Angeles, and moved to Temecula in 1887 where he worked as clerk in the old government store in charge of Louis Wolf. Around 1889, he became owner of Machado & Co., a general store located downtown along the main street. In addition to his mercantile business, Mac had real-estate and mineral interests. Mac owned four hundred acres of land, and interest in twenty-five hundred acres of farming land within Riverside County. He also owned large interests in the tourmaline and beryl mines at Rincon and Smith mountain (Aguanga). Mac also owned a then-famous granite quarry near Temecula, where slabs of beautiful gray granite were cut and hauled by wagon or shipped by way of rail to their destination. While living out his life in Temecula, he also served two terms as chief ranger, four years as deputy assessor, a year as game warden, and one and a half years as postmaster. Although his surname was Machado, most people only knew him as "Mac". It is likely he occasionally used the informal English name of "John" for reasons of Spanish anonymity, and Anglo-Saxon congruence, which was common practice during the early 20th Century.2.Also known as Feliz Calac. According to J. B. Hanley, an agreement was made between John Mack and Feliz Calac, to mine for gemstones occurring on Calac's ranch, which was described in 1958 by F. H. Weber as patented ranch land.

Regions containing this locality

Pacific PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


10 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Weber, F. H. 1963. Geology and mineral resources of San Diego County, California. California Division of Mines and Geology, County Report 3: p. 106, illus., maps.
'Almandine-Spessartine Series'
Reference: Van King
Beryl
Formula: Be3Al2(Si6O18)
Reference: Kunz, G. F. (1905a) Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: 49; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 103; Weber, F. H. (1963), Geology and mineral resources of San Diego County, California. California Division of Mines and Geology, County Report 3: 106, illus., maps.
Beryl var: Aquamarine
Formula: Be3Al2Si6O18
Reference: Weber, F. H. 1963. Geology and mineral resources of San Diego County, California. California Division of Mines and Geology, County Report 3: p. 106, illus., maps.; Jesse Fisher (2011) Mines and Minerals of the Southern California Pegmatite Province. Rocks & Minerals 86:14-34.
Beryl var: Heliodor
Formula: Be3Al2(Si6O18)
Reference: Kunz, G. F. 1905. Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: p. 50.
Beryl var: Morganite
Formula: Be3Al2(Si6O18)
Reference: Kunz, G. F. (1905a) Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: 49; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 103.
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Hanley, J. B. 1951. Economic Geology of the Rincon Pegmatites, San Diego County, California. Department of Natural Resources, California Division of Mines, Special Report 7B: p 15-18.
'Clays'
Reference: Kunz, G. F. 1905. Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: p. 50.
'Columbite-(Fe)-Columbite-(Mn) Series'
Reference: Kunz, G. F. 1905. Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: p. 50; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 155.
'Feldspar Group'
Reference: Weber, F. H. 1963. Geology and mineral resources of San Diego County, California. California Division of Mines and Geology, County Report 3: p. 106, illus., maps.
'Feldspar Group var: Perthite'
Reference: Weber, F. H. 1963. Geology and mineral resources of San Diego County, California. California Division of Mines and Geology, County Report 3: p. 106, illus., maps.
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Van King
Gahnite ?
Formula: ZnAl2O4
Description: May be true identity of the "spinel" reported in 1914.
Reference: Van King
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs as well-formed, euhedral crystals to 10 mm lining pockets.
Reference: Rogers, Austin Flint (1910b), Minerals from the pegmatite veins of Rincon, San Diego County, California: Columbia Univ., School of Mines Quart.: 31: 214; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 275; Weber, F. H. (1963), Geology and mineral resources of San Diego County, California. California Division of Mines and Geology, County Report 3: p. 106, illus., maps.
Orthoclase
Formula: K(AlSi3O8)
Reference: Kunz, G. F. 1905. Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: p. 137-139.
Quartz
Formula: SiO2
Reference: Weber, F. H. 1963. Geology and mineral resources of San Diego County, California. California Division of Mines and Geology, County Report 3: p. 106, illus., maps.; Kunz, G. F. 1905. Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: p. 50.; Rock Currier
Quartz var: Smoky Quartz
Formula: SiO2
Reference: Hanley, J. B. 1951. Economic Geology of the Rincon Pegmatites, San Diego County, California. Department of Natural Resources, California Division of Mines, Special Report 7B: p 15-18.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Kunz, G. F. 1905. Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: p. 50.
Spinel
Formula: MgAl2O4
Colour: Blue
Reference: Rogers, A. F. (1910b), Minerals From The Pegmatite Veins Of Rincon, San Diego Co., California. Columbia University School Of Mines Quarterly Journal Of Applied Science, Vol. 31 pp. 208-218; Merrill, F. J. H. (1914), Geology and Mineral Resources of San Diego and Imperial Counties: Gems, Lithia Minerals. California State Mining Bureau, San Francisco, Cal. California State Printing Office, December. Chapter 1, pages 61-110; Murdoch, Joseph & Webb, Robert W. (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 346; Pemberton, H. Earl (1983), Minerals of California: 148.
Spinel var: Pleonaste
Formula: (Mg,Fe)Al2O4
Reference: Kunz, G. F. (1905a), Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: 48; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 346.
Topaz
Formula: Al2(SiO4)(F,OH)2
Reference: Rock Currier
'Tourmaline'
Formula: A(D3)G6(Si6O18)(BO3)3X3Z
Reference: Kunz, G. F. 1905. Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: p. 50.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Gahnite ?4.BB.05ZnAl2O4
Quartz4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Spinel4.BB.05MgAl2O4
var: Pleonaste4.BB.05(Mg,Fe)Al2O4
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Beryl9.CJ.05Be3Al2(Si6O18)
var: Aquamarine9.CJ.05Be3Al2Si6O18
var: Heliodor9.CJ.05Be3Al2(Si6O18)
var: Morganite9.CJ.05Be3Al2(Si6O18)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Orthoclase9.FA.30K(AlSi3O8)
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Topaz9.AF.35Al2(SiO4)(F,OH)2
Unclassified Minerals, Rocks, etc.
'Almandine-Spessartine Series'-
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Clays'-
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Feldspar Group'-
'var: Perthite'-
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB2X4
Gahnite ?7.2.1.4ZnAl2O4
Spinel7.2.1.1MgAl2O4
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Topaz52.3.1.1Al2(SiO4)(F,OH)2
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Orthoclase76.1.1.1K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Almandine-Spessartine Series'-
Beryl
var: Aquamarine
-Be3Al2Si6O18
var: Heliodor-Be3Al2(Si6O18)
var: Morganite-Be3Al2(Si6O18)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Clays'-
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Feldspar Group'-
'var: Perthite'-
Quartz
var: Smoky Quartz
-SiO2
Spinel
var: Pleonaste
-(Mg,Fe)Al2O4
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H TopazAl2(SiO4)(F,OH)2
BeBeryllium
Be BerylBe3Al2(Si6O18)
Be Beryl (var: Aquamarine)Be3Al2Si6O18
Be Beryl (var: Heliodor)Be3Al2(Si6O18)
Be Beryl (var: Morganite)Be3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
OOxygen
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O FluorapatiteCa5(PO4)3F
O QuartzSiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
O AlbiteNa(AlSi3O8)
O BerylBe3Al2(Si6O18)
O Beryl (var: Aquamarine)Be3Al2Si6O18
O Beryl (var: Heliodor)Be3Al2(Si6O18)
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
O OrthoclaseK(AlSi3O8)
O Quartz (var: Smoky Quartz)SiO2
O SpinelMgAl2O4
O Beryl (var: Morganite)Be3Al2(Si6O18)
O Spinel (var: Pleonaste)(Mg,Fe)Al2O4
O TopazAl2(SiO4)(F,OH)2
O GahniteZnAl2O4
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
F FluorapatiteCa5(PO4)3F
F TopazAl2(SiO4)(F,OH)2
NaSodium
Na AlbiteNa(AlSi3O8)
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Mg SpinelMgAl2O4
Mg Spinel (var: Pleonaste)(Mg,Fe)Al2O4
AlAluminium
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al AlbiteNa(AlSi3O8)
Al BerylBe3Al2(Si6O18)
Al Beryl (var: Aquamarine)Be3Al2Si6O18
Al Beryl (var: Heliodor)Be3Al2(Si6O18)
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al OrthoclaseK(AlSi3O8)
Al SpinelMgAl2O4
Al Beryl (var: Morganite)Be3Al2(Si6O18)
Al Spinel (var: Pleonaste)(Mg,Fe)Al2O4
Al TopazAl2(SiO4)(F,OH)2
Al GahniteZnAl2O4
SiSilicon
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si QuartzSiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si AlbiteNa(AlSi3O8)
Si BerylBe3Al2(Si6O18)
Si Beryl (var: Aquamarine)Be3Al2Si6O18
Si Beryl (var: Heliodor)Be3Al2(Si6O18)
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
Si OrthoclaseK(AlSi3O8)
Si Quartz (var: Smoky Quartz)SiO2
Si Beryl (var: Morganite)Be3Al2(Si6O18)
Si TopazAl2(SiO4)(F,OH)2
PPhosphorus
P FluorapatiteCa5(PO4)3F
KPotassium
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K MuscoviteKAl2(AlSi3O10)(OH)2
K OrthoclaseK(AlSi3O8)
CaCalcium
Ca FluorapatiteCa5(PO4)3F
FeIron
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe Spinel (var: Pleonaste)(Mg,Fe)Al2O4
ZnZinc
Zn GahniteZnAl2O4

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Kunz, G. F. (1905a) Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau bulletin 37: 48, 50, 137-139.
Eakle, Arthur Starr (1906), Notes on lawsonite, columbite, beryl, barite, and calcite: University of California, Department of Geological Science Bulletin: 89.
Guinn, J. M. (1907), A History of California: Historical and Biographical Record: Macedonia Llora Merrion Machado. Historic Record Company, Los Angeles, California: 1: 1027.
Rogers, Austin Flint (1910b), Minerals from the pegmatite veins of Rincon, San Diego County, California: Columbia Univ., School of Mines Quart.: 31: 209, 212, 214, 217.
Merrill, F. J. H. (1914), Geology and Mineral Resources of San Diego and Imperial Counties: Gems, Lithia Minerals. California State Mining Bureau, San Francisco, Cal. California State Printing Office, December. Chapter 1, pages 61-110.
Hanley, J. B. (1951) Economic Geology of the Rincon Pegmatites, San Diego County, California. Department of Natural Resources, California Division of Mines, Special Report 7B: 14, 17, 18, 15-23 illus., maps.
Weber, F. H. (1963), Mines and mineral resources of San Diego County, California. California Division of Mines and Geology, County Report 3: 106, illus., maps.
Murdoch, Joseph & Webb, Robert W. (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 79, 103, 155, 275, 346.
Rynerson, F. J. (1967), Exploring and mining for Gems and Gold in the West. Happy Camp, California: Naturegraph Publishers, Inc.: 198.
Pemberton, H. Earl (1983), Minerals of California: 148, 177, 317, 426, 447.
Fisher, J. (2002), Gem and rare-element pegmatites of southern California. Mineralogical Record: 33: 389-390.
Driggs, T. A. (2003), The Old Spanish California Machado family; Macedonia Llora Merrion Machado "Mac" and Dora Alice Vaughn "Allie".
Fisher, Jesse (2011), Mines and Minerals of the Southern California Pegmatite Province. Rocks & Minerals: 86: 14-34.


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