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Edwards Mine (Mother Lode Mine; Mother Lode group), San Luis Mts, Arivaca District (Las Guijas District), Las Guijas & San Luis Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 32' 10'' North , 111° 20' 38'' West
Latitude & Longitude (decimal): 31.53611,-111.34389
GeoHash:G#: 9t8g6kcz5
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate


‡Ref.: Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 105 (Table 4).

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039608, MRDS ID #M050483; and, Dep. ID #10210203, MAS ID #0040190203.

A former small underground Ag-Au-Cu-Pb-Zn mine located in North-central (NE¼NW¼) sec. 8 T.22S., R.10E., 3 miles S of Arivaca. Produced 1928-1937. Operated by M.T. Edwards.

Mineralization is oxidized and weathered quartz lenses with free gold and silver chlorides (?) near the surface, and spotty base metal sulfides in depth, along fracture zones in metamorphosed Cretaceous sedimentary formations.

Workings include shaft and tunnel operations. Worked prior to 1900 and intermittently from 1928 to 1940. It produced over 100 tons of ore averaging 4 oz. Au/T, 14 oz. Ag/T, 1.6% Cu and 0.6% Pb.

Regions containing this locality

Sonoran Desert, North America

Desert - 1,135 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

Cerussite
Formula: PbCO3
Reference: Collected by Mark Ascher Sight Identified
Chlorargyrite ?
Formula: AgCl
Description: Near-surface.
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 105 (Table 4); Arizona Bureau of Mines file data.
Gold
Formula: Au
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 105 (Table 4); Arizona Bureau of Mines file data.
Mottramite
Formula: PbCu(VO4)(OH)
Reference: Collected by Mark Ascher Sight Identified
Wulfenite
Formula: Pb(MoO4)
Reference: Collected by Mark Ascher Sight Identified

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Gold'1.AA.05Au
Group 3 - Halides
'Chlorargyrite' ?3.AA.15AgCl
Group 5 - Nitrates and Carbonates
'Cerussite'5.AB.15PbCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Wulfenite'7.GA.05Pb(MoO4)
Group 8 - Phosphates, Arsenates and Vanadates
'Mottramite'8.BH.40PbCu(VO4)(OH)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 9 - NORMAL HALIDES
AX
Chlorargyrite ?9.1.4.1AgCl
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Cerussite14.1.3.4PbCO3
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Mottramite41.5.2.2PbCu(VO4)(OH)
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Wulfenite48.1.3.1Pb(MoO4)

List of minerals for each chemical element

HHydrogen
H MottramitePbCu(VO4)(OH)
CCarbon
C CerussitePbCO3
OOxygen
O CerussitePbCO3
O MottramitePbCu(VO4)(OH)
O WulfenitePb(MoO4)
ClChlorine
Cl ChlorargyriteAgCl
VVanadium
V MottramitePbCu(VO4)(OH)
CuCopper
Cu MottramitePbCu(VO4)(OH)
MoMolybdenum
Mo WulfenitePb(MoO4)
AgSilver
Ag ChlorargyriteAgCl
AuGold
Au GoldAu
PbLead
Pb CerussitePbCO3
Pb MottramitePbCu(VO4)(OH)
Pb WulfenitePb(MoO4)

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary - Miocene
0 - 23.03 Ma



ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Campanian - Oxfordian
72.1 - 163.5 Ma



ID: 2847779
Cretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks

Age: Mesozoic (72.1 - 163.5 Ma)

Stratigraphic Name: Temporal Formation; Bathtub Formation; Sand Wells Formation; Fort Crittenden Formation; McCoy Mountains Formation

Description: Sandstone and conglomerate, rarely forms prominent outcrops; massive conglomerate is typical near base of unit and locally in upper part. These deposits are nonmarine except in southeastern Arizona, where prominent gray marine limestone (Mural Limestone) forms the middle of the Bisbee Group. Sandstones are typically medium-bedded, drab brown, lithic-feldspathic arenites. Includes Bisbee Group (largely Early Cretaceous) and related rocks, Temporal, Bathtub, and Sand Wells formations, rocks of Gu Achi, McCoy Mountains Formation, and Upper Cretaceous Fort Crittenden Formation and equivalent rocks. (80-160 Ma)

Comments: Original map source: Arizona Geological Survey, DI-8 Geologic Map of Arizona, Digital Spatial data for the Geologic Map of Arizona, v. 3.0, edited by S.M. Richard and S.M. Kneale, 2002, 10 p., 2 DOS HD disks. Arc/INFO export file (.e00) format, scale 1:1,000,000.

Lithology: Major:{arenite,conglomerate}, Minor:{limestone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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