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Agnew Meadow Mine (Agnew Meadow Manganese prospect/deposit; Mammoth Lakes), Olaine Lake, Agnew Meadows, Madera County, California, USAi
Regional Level Types
Agnew Meadow Mine (Agnew Meadow Manganese prospect/deposit; Mammoth Lakes)Mine
Olaine LakeLake
Agnew Meadows- not defined -
Madera CountyCounty
CaliforniaState
USACountry

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Latitude & Longitude (WGS84):
37° 40' 56'' North , 119° 4' 58'' West
Latitude & Longitude (decimal):
Type:
Nearest Settlements:
PlacePopulationDistance
Mammoth Lakes7,946 (2018)10.4km
June Lake629 (2011)10.8km
Lee Vining222 (2011)30.8km
Sunny Slopes182 (2017)38.0km
Mono City172 (2011)40.2km
Mindat Locality ID:
30934
Long-form identifier:
mindat:1:2:30934:8
GUID (UUID V4):
77d75d9b-71ab-40f7-b9ba-be71ac913112


A former Mn-Fe mine located in the SW¼ sec. 15, T3S, R26E, MDM, about 3.0 km (10,000 feet) ESE of Olaine Lake on Agnew Meadows (flat/swamp) (10 miles from Mammoth, in the upper part of the canyon of the Middle Fork San Joaquin River. Lat/Long estimated at culture evidence in Agnew Meadows), on National Forest wilderness land (Ansel Adams Wilderness). Owned by Charles Summers and Dr Henry A. Stevens, California (1974). MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is a replacement deposit. The ore body is 1.83 meters wide and 3.05 meters long. The mineralization is hydrothermal deposits of vein origin at the intersection of the vertical mineralized zones and schist. Mineralized zones strike N40E and are essentially vertical. They are characterized by garnet, some of which is typical skarn, and by pyrite, epidote, rhodonite, rhodochrosite, piedmontite (?) and a green mineral that weathers to a black manganese oxide (johannsenite ?). The rhodonite is in a localized zone, 2 to 3 feet wide, and the rhodochrosite is in a similar zone above the rhodonite. Local rocks include Mesozoic volcanic rocks, unit 3 (Mojave Desert, Death Valley area, and Eastern Sierra Nevada).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


11 valid minerals.

Detailed Mineral List:

Bustamite
Formula: CaMn2+(Si2O6)
Colour: Pale pink
Description: Massive material.
Calcite
Formula: CaCO3
Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
'Garnet Group'
Formula: X3Z2(SiO4)3
Hematite
Formula: Fe2O3
Hematite var. Specularite
Formula: Fe2O3
Magnetite
Formula: Fe2+Fe3+2O4
Manganhumite
Formula: (Mn2+,Mg)7(SiO4)3(OH)2
Metamunirite
Formula: NaVO3
Piemontite
Formula: (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)
Pyrite
Formula: FeS2
Rhodochrosite
Formula: MnCO3
Rhodonite
Formula: CaMn3Mn[Si5O15]

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Hematite4.CB.05Fe2O3
var. Specularite4.CB.05Fe2O3
Metamunirite4.HD.20NaVO3
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Rhodochrosite5.AB.05MnCO3
Group 9 - Silicates
Manganhumite9.AF.50(Mn2+,Mg)7(SiO4)3(OH)2
Epidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Piemontite9.BG.05a(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)
Bustamite9.DG.05CaMn2+(Si2O6)
Rhodonite9.DK.05CaMn3Mn[Si5O15]
Unclassified
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
H Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
H Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
H Piemontite(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)
CCarbon
C CalciteCaCO3
C RhodochrositeMnCO3
OOxygen
O BustamiteCaMn2+(Si2O6)
O CalciteCaCO3
O Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
O HematiteFe2O3
O Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
O MagnetiteFe2+Fe23+O4
O MetamuniriteNaVO3
O Piemontite(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)
O RhodochrositeMnCO3
O RhodoniteCaMn3Mn[Si5O15]
O Hematite var. SpeculariteFe2O3
O Garnet GroupX3Z2(SiO4)3
NaSodium
Na MetamuniriteNaVO3
MgMagnesium
Mg Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
AlAluminium
Al Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Al Piemontite(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)
SiSilicon
Si BustamiteCaMn2+(Si2O6)
Si Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Si Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
Si Piemontite(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)
Si RhodoniteCaMn3Mn[Si5O15]
Si Garnet GroupX3Z2(SiO4)3
SSulfur
S PyriteFeS2
CaCalcium
Ca BustamiteCaMn2+(Si2O6)
Ca CalciteCaCO3
Ca Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Ca Piemontite(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)
Ca RhodoniteCaMn3Mn[Si5O15]
VVanadium
V MetamuniriteNaVO3
MnManganese
Mn BustamiteCaMn2+(Si2O6)
Mn Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
Mn Piemontite(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)
Mn RhodochrositeMnCO3
Mn RhodoniteCaMn3Mn[Si5O15]
FeIron
Fe Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Fe HematiteFe2O3
Fe MagnetiteFe2+Fe23+O4
Fe PyriteFeS2
Fe Hematite var. SpeculariteFe2O3

Other Databases

Link to USGS MRDS:10095174

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate
USA

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

 
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