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Last Chance Mine, Washougal River, Washougal District, Skamania Co., Washington, USAi
Regional Level Types
Last Chance MineMine
Washougal RiverRiver
Washougal DistrictMining District
Skamania Co.County
WashingtonState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84): 45° 42' 36'' North , 122° 12' 52'' West
Latitude & Longitude (decimal): 45.71009,-122.21451
GeoHash:G#: c21h4cq0e
USGS MRDS Record:10047849
Locality type:Mine
Köppen climate type:Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Fern Prairie1,884 (2011)16.5km
Venersborg3,745 (2011)17.8km
Washougal15,288 (2017)17.8km
Camas21,846 (2017)19.8km
North Bonneville971 (2017)20.6km


A former Cu-V-Au-Ag-Pb-Zn mine located in the SW¼SE¼ of sec. 29, T3, R5E, on the Washougal River.

Mineralization is a sparsely mineralized shear zone in diorite.

Workings include underground openings comprised of a 475 foot deep shaft, a 930 foot long adit, and a caved adit.
Alteration: Locally Extensive Silicification And Argillization In Vein But Wall Rocks Only Weakly Propylitized

Tectonics: Cascade Volcanic Arc

Deposit: Quartz-filled fissure vein in quartz diorite phase of silver star pluton. Vein is 1-10 ft thick, much of which consists of 1-4 ft of massive quartz. Thicker parts of vein consist of several narrow quartz veins alternating with highly brecciated and silicified quartz diorite. Bornite, chalcocite, and chalocpyrite occur As disseminations and blebs in the vein quartz; chrysocolla, malachite, and azurite coat fracture surfaces. In a few places, chrysolcolla forms 1-6 in. Thick veins. Descloizite (lead vanadate) locally forms thin greenish-yellow coatings on vein surfaces. Maps of mine workings and location map available in moen (1977) ; info.src : 1 pub lit

Deposit type: Polymetallic veins

Development: Although considerable development work was undertaken in the early 1900's, no shipments of ore were made. Mine idle in 1977

Rock formation(s): Silver Star Pluton


Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


12 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Bornite
Formula: Cu5FeS4
Reference: Huntting, M. (1956): Inventory of Washington Minerals, Part II, Metallic Minerals, Vol. 1; Cannon, B. (1975): Minerals of Washington, p.73; Howard, D and B. Tompkins (2000) Minerals of the Last Chance Mine, Skamania County Washington; USA Micro Probe, newsletter of the NorthWest MicroMineral Study Group, Spring 2000, Volume 1X, Number 1, pgs 7-9.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Calcite
Formula: CaCO3
Reference: Howard, D and B. Tompkins (2000) Minerals of the Last Chance Mine, Skamania County Washington; USA Micro Probe, newsletter of the NorthWest MicroMineral Study Group, Spring 2000, Volume 1X, Number 1, pgs 7-9.
Chalcocite
Formula: Cu2S
Reference: Howard, D and B. Tompkins (2000) Minerals of the Last Chance Mine, Skamania County Washington; USA Micro Probe, newsletter of the NorthWest MicroMineral Study Group, Spring 2000, Volume 1X, Number 1, pgs 7-9.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Chalcopyrite
Formula: CuFeS2
Reference: Howard, D and B. Tompkins (2000) Minerals of the Last Chance Mine, Skamania County Washington; USA Micro Probe, newsletter of the NorthWest MicroMineral Study Group, Spring 2000, Volume 1X, Number 1, pgs 7-9.
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: Huntting, M. (1956): Inventory of Washington Minerals, Part II, Metallic Minerals, Vol. 1; Cannon, B. (1975): Minerals of Washington, p.73; Howard, D and B. Tompkins (2000) Minerals of the Last Chance Mine, Skamania County Washington; USA Micro Probe, newsletter of the NorthWest MicroMineral Study Group, Spring 2000, Volume 1X, Number 1, pgs 7-9.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Descloizite ?
Formula: PbZn(VO4)(OH)
Description: No zinc
Reference: Inventory of Washington Minerals, Part II, Metalic Minerals, Vol. 1; M. Huntting, 1956; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: personal identification with Bart Cannon; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Mottramite
Formula: PbCu(VO4)(OH)
Reference: Cannon, B. (1975): Minerals of Washington, p.73; Howard, D and B. Tompkins (2000) Minerals of the Last Chance Mine, Skamania County Washington; USA Micro Probe, newsletter of the NorthWest MicroMineral Study Group, Spring 2000, Volume 1X, Number 1, pgs 7-9.
Pyrite
Formula: FeS2
Reference: Howard, D and B. Tompkins (2000) Minerals of the Last Chance Mine, Skamania County Washington; USA Micro Probe, newsletter of the NorthWest MicroMineral Study Group, Spring 2000, Volume 1X, Number 1, pgs 7-9.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyromorphite
Formula: Pb5(PO4)3Cl
Reference: personal identification with Bart Cannon
Quartz
Formula: SiO2
Reference: Inventory of Washington Minerals, Part II, Metalic Minerals, Vol. 1; M. Huntting, 1956; Howard, D and B. Tompkins (2000) Minerals of the Last Chance Mine, Skamania County Washington; USA Micro Probe, newsletter of the NorthWest MicroMineral Study Group, Spring 2000, Volume 1X, Number 1, pgs 7-9.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Wad'
Reference: Howard, D and B. Tompkins (2000) Minerals of the Last Chance Mine, Skamania County Washington; USA Micro Probe, newsletter of the NorthWest MicroMineral Study Group, Spring 2000, Volume 1X, Number 1, pgs 7-9.
Wulfenite
Formula: Pb(MoO4)
Reference: personal identification with Bart Cannon

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Wulfenite7.GA.05Pb(MoO4)
Group 8 - Phosphates, Arsenates and Vanadates
Descloizite ?8.BH.40PbZn(VO4)(OH)
Mottramite8.BH.40PbCu(VO4)(OH)
Pyromorphite8.BN.05Pb5(PO4)3Cl
Group 9 - Silicates
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Unclassified Minerals, Rocks, etc.
'Wad'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Descloizite ?41.5.2.1PbZn(VO4)(OH)
Mottramite41.5.2.2PbCu(VO4)(OH)
A5(XO4)3Zq
Pyromorphite41.8.4.1Pb5(PO4)3Cl
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Wulfenite48.1.3.1Pb(MoO4)
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Wad'-

List of minerals for each chemical element

HHydrogen
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H MottramitePbCu(VO4)(OH)
H MalachiteCu2(CO3)(OH)2
H DescloizitePbZn(VO4)(OH)
CCarbon
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
OOxygen
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O MottramitePbCu(VO4)(OH)
O QuartzSiO2
O CalciteCaCO3
O WulfenitePb(MoO4)
O PyromorphitePb5(PO4)3Cl
O MalachiteCu2(CO3)(OH)2
O DescloizitePbZn(VO4)(OH)
AlAluminium
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SiSilicon
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si QuartzSiO2
PPhosphorus
P PyromorphitePb5(PO4)3Cl
SSulfur
S BorniteCu5FeS4
S PyriteFeS2
S ChalcociteCu2S
S ChalcopyriteCuFeS2
ClChlorine
Cl PyromorphitePb5(PO4)3Cl
CaCalcium
Ca CalciteCaCO3
VVanadium
V MottramitePbCu(VO4)(OH)
V DescloizitePbZn(VO4)(OH)
FeIron
Fe BorniteCu5FeS4
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
CuCopper
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu MottramitePbCu(VO4)(OH)
Cu BorniteCu5FeS4
Cu ChalcociteCu2S
Cu ChalcopyriteCuFeS2
Cu MalachiteCu2(CO3)(OH)2
ZnZinc
Zn DescloizitePbZn(VO4)(OH)
MoMolybdenum
Mo WulfenitePb(MoO4)
PbLead
Pb MottramitePbCu(VO4)(OH)
Pb WulfenitePb(MoO4)
Pb PyromorphitePb5(PO4)3Cl
Pb DescloizitePbZn(VO4)(OH)

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

Neogene
2.588 - 23.03 Ma



ID: 3186305
Cenozoic volcanic rocks

Age: Neogene (2.588 - 23.03 Ma)

Stratigraphic Name: Columbia River Basalt

Comments: Columbia Plateau

Lithology: Flood basalt(s); mafic volcanic rocks; basalt

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]

Miocene
5.333 - 23.03 Ma



ID: 1439786
Silver Star pluton

Age: Miocene (5.333 - 23.03 Ma)

Lithology: Quartz diorite

Reference: Washington State Department of Natural Resources, Division of Geology and Earth Resources. Washington Interactive Geologic Map: 1:100,000 scale. Washington Division of Geology and Earth Resources. [19]

Middle Miocene - Early Paleocene
11.62 - 66 Ma



ID: 2727843
Tertiary granitic rocks

Age: Cenozoic (11.62 - 66 Ma)

Stratigraphic Name: Chilliwack Group; Silver Star Granodiorite; Snoqualmie Granodiorite

Description: Granite, quartz monzonite, quartz diorite, granodiorite, and trondhjemite. Includes dacite porphyry and granite breccia near Bumping Lake, Yakima County.

Comments: Chilliwack granodiorite and quartz diorite; Golden Horn batholith; Silver Star granodiorite; Snoqualmie granodiorite; Index batholith; Grotto batholith (possibly the same as Snoqualmie); Oval Peak batholith; Fawn Peak stock; Pasayten stock-dike; Monument Peak stock; Castle Peak stock; Lost Peak stock; The intrusive volcanic rocks near Bumping Lake include hypabyssal dacite, rhyolite, and andesite (Walsh and others, 1987). Original map source: Raines, Gary L., and Johnson, Bruce R., 1996, Digital representation of the Washington state geologic map; a contribution to the Interior Columbia River basin ecosystem management project, U.S. Geological Survey Open-file report 95-0684, 20 p., plus digi

Lithology: Major:{granodiorite,granite}, Minor:{quartz diorite,quartz monzonite}, Incidental:{diorite, tonalite, hypabyssal dacite, hypabyssal andesite, hypabyssal rhyolite, gabbro}

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Brerton, R.M. (1930) Plat of the Last Chance Mine, Washington Division of Geology and Earth Sciences, unpublished map (1930).
Huntting, M. (1956): Inventory of Washington Minerals, Part II, Metallic Minerals, Vol. 1.
Cannon, B. (1975): Minerals of Washington, p.73.
Moen, Wayne (1977) St. Helens and Washougal Mining Districts of the Southern Cascades of Washington, State of Washington, Department of Natural Resources, Division of Geology and Earth Sciences, Information Circular 60.
Howard, D and B. Tompkins (2000) Minerals of the Last Chance Mine, Skamania County Washington; USA Micro Probe, newsletter of the NorthWest MicroMineral Study Group, Spring 2000, Volume IX(1): 7-9.
Huntting, M.T., (1956), Inventory of Washington Mineral - Part Ii, Metallic Minerals: Washington Division of Mines and Geology Bulletin 37, V. 1, P. 77.
Moen, W.S., (1977), St. Helens and Washougal Mining Districts of the Southern Cascades of Washington: Washington Division of Geology and Earth Resources Information Circular 60, P. 43, 53-55.
Phillips, W.M., (1987), Geologic Map of the Vancouver Quadrangle, Washington and Oregon: Washington Division of Geology and Earth Resources Open-file Report 87-10, Scale 1:100,000.


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