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Engineer Gold Mine, Tagish Lake, Atlin Mining Division, British Columbia, Canadai
Regional Level Types
Engineer Gold MineMine
Tagish LakeLake
Atlin Mining DivisionDivision
British ColumbiaProvince
CanadaCountry

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Key
Latitude & Longitude (WGS84):
59° 33' 46'' North , 134° 15' 17'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Owned/operated by:


Though the deposit was discovered in 1899, the Engineer mine was only operated sporadically from 1907 to 1952, and then not again until the early 1990s. Well-crystallized “gold” is actually in the form of silver-dominant electrum—highly auriferous silver with gold contents ranging from 40 to 42 atomic percent. It is typically intimately associated with pyrrhotite and roscoelite in dendritic to leafy aggregates and in platy to wire-like crystals. This association is generally found as clasts and irregular nodules in the brecciated epithermal veins of the deposit. Leaf electrum (flat octahedra), to several centimeters, and more equant gold crystals —generally no more than 1 mm in size—also occur in calcite-filled quartz-crystal vugs (Mauthner et al. 2006).

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


19 valid minerals. 2 erroneous literature entries.

Detailed Mineral List:

Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273.
Antimony
Formula: Sb
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273.
Arsenic
Formula: As
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273. G. W. Robinson, V. King (1993) Whats New in Minerals. Mineralogical Record 24:381-395
Arsenopyrite
Formula: FeAsS
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273.
Berthierite
Formula: FeSb2S4
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273.
Bismuth ?
Formula: Bi
Reference: Traill (1983), sourced from Cairnes (1911); unreliable
Calaverite
Formula: AuTe2
Reference: Calaverite was reported by Cairnes (1911), who, without any data, surmised that Gwillim's (1900) "telluride", was "probably calaverite". There is no credible basis for the existence calaverite at the Engineer mine.
Calcite
Formula: CaCO3
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273. Mauthner, M. and C. A. Francis (2006) Gold Crystal Localities of British Columbia, Canada. Rocks & Minerals 81:14-22
Chalcopyrite
Formula: CuFeS2
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273.
'Electrum'
Formula: (Au,Ag)
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273. G. W. Robinson, V. King (1993) Whats New in Minerals. Mineralogical Record 24:381-395 Mauthner, M. and C. A. Francis (2006) Gold Crystal Localities of British Columbia, Canada. Rocks & Minerals 81:14-22
Fluorite
Formula: CaF2
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273.
Gold
Formula: Au
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273. Mauthner, M. and C. A. Francis (2006) Gold Crystal Localities of British Columbia, Canada. Rocks & Minerals 81:14-22
Löllingite
Formula: FeAs2
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Millonig et al. (2017) "The Engineer Mine, British Columbia: An example of epithermal Au-Ag mineralization with mixed alkaline and sub alkaline characteristics." Ore Geology Reviews 83:235–257.
Muscovite var: Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
Reference: Millonig et al. (2017) "The Engineer Mine, British Columbia: An example of epithermal Au-Ag mineralization with mixed alkaline and sub alkaline characteristics." Ore Geology Reviews 83:235–257.
Paradocrasite
Formula: Sb3As
Reference: Described from the Engineer Mine by Cureton 1996 [Min Rec 27(1)70-71]. Gunnar Färber
Pyrite
Formula: FeS2
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273.
Pyrrhotite
Formula: Fe7S8
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273. Mauthner, M. and C. A. Francis (2006) Gold Crystal Localities of British Columbia, Canada. Rocks & Minerals 81:14-22
Quartz
Formula: SiO2
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273. Mauthner, M. and C. A. Francis (2006) Gold Crystal Localities of British Columbia, Canada. Rocks & Minerals 81:14-22
Roscoelite
Formula: K(V3+,Al)2(AlSi3O10)(OH)2
Description: Millonig et al (2017) reported that the "roscoelite" at the Engineer mine is, in fact, a vanadian illite.
Reference: Millonig et al. (2017) "The Engineer Mine, British Columbia: An example of epithermal Au-Ag mineralization with mixed alkaline and sub alkaline characteristics." Ore Geology Reviews 83:235–257. Mauthner, M.H. , Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273. G. W. Robinson, V. King (1993) Whats New in Minerals. Mineralogical Record 24:381-395 Mauthner, M. and C. A. Francis (2006) Gold Crystal Localities of British Columbia, Canada. Rocks & Minerals 81:14-22
Siderite
Formula: FeCO3
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273.
Silver
Formula: Ag
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273.
Stibarsen
Formula: AsSb
Reference: Mark H.F. Mauthner, Groat, L.A. and Raudsepp, M. (1996). "The Engineer Mine, Tagish Lake, British Columbia." Mineralogical Record, 27(4),pp:263-273. G. W. Robinson, V. King (1993) Whats New in Minerals. Mineralogical Record 24:381-395

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Antimony1.CA.05Sb
Arsenic1.CA.05As
Bismuth ?1.CA.05Bi
'Electrum'1.AA.05(Au,Ag)
Gold1.AA.05Au
Paradocrasite1.CA.15Sb3As
Silver1.AA.05Ag
Stibarsen1.CA.05AsSb
Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Berthierite2.HA.20FeSb2S4
Calaverite ?2.EA.10AuTe2
Chalcopyrite2.CB.10aCuFeS2
Löllingite2.EB.15aFeAs2
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Calcite5.AB.05CaCO3
Siderite5.AB.05FeCO3
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Illite9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
Roscoelite ?9.EC.15K(V3+,Al)2(AlSi3O10)(OH)2

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
Silver1.1.1.2Ag
Semi-metals and non-metals
Antimony1.3.1.2Sb
Arsenic1.3.1.1As
Bismuth ?1.3.1.4Bi
Paradocrasite1.3.1.7Sb3As
Stibarsen1.3.1.3AsSb
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Calaverite ?2.12.13.2AuTe2
Löllingite2.12.2.9FeAs2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
ø = 2
Berthierite3.7.9.3FeSb2S4
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Siderite14.1.1.3FeCO3
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
var: Illite71.2.2d.2K0.65Al2.0[Al0.65Si3.35O10](OH)2
Roscoelite ?71.2.2a.4K(V3+,Al)2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Electrum'-(Au,Ag)

List of minerals for each chemical element

HHydrogen
H Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
CCarbon
C AnkeriteCa(Fe2+,Mg)(CO3)2
C CalciteCaCO3
C SideriteFeCO3
OOxygen
O AnkeriteCa(Fe2+,Mg)(CO3)2
O CalciteCaCO3
O QuartzSiO2
O SideriteFeCO3
O Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
O MuscoviteKAl2(AlSi3O10)(OH)2
O RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
FFluorine
F FluoriteCaF2
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
AlAluminium
Al Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
SiSilicon
Si QuartzSiO2
Si Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
SSulfur
S ArsenopyriteFeAsS
S BerthieriteFeSb2S4
S ChalcopyriteCuFeS2
S PyriteFeS2
S PyrrhotiteFe7S8
KPotassium
K Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
K RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
CaCalcium
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca CalciteCaCO3
Ca FluoriteCaF2
VVanadium
V RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
FeIron
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe ArsenopyriteFeAsS
Fe BerthieriteFeSb2S4
Fe ChalcopyriteCuFeS2
Fe LöllingiteFeAs2
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe SideriteFeCO3
CuCopper
Cu ChalcopyriteCuFeS2
AsArsenic
As ArsenopyriteFeAsS
As ArsenicAs
As LöllingiteFeAs2
As StibarsenAsSb
As ParadocrasiteSb3As
AgSilver
Ag Electrum(Au,Ag)
Ag SilverAg
SbAntimony
Sb AntimonySb
Sb BerthieriteFeSb2S4
Sb StibarsenAsSb
Sb ParadocrasiteSb3As
TeTellurium
Te CalaveriteAuTe2
AuGold
Au Electrum(Au,Ag)
Au GoldAu
Au CalaveriteAuTe2
BiBismuth
Bi BismuthBi

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Traill (1983) Catalogue of Canadian minerals. GSC Paper 80-18
Mauthner, M.H.F., Groat, L.A. and Raudsepp, M. (1996). The Engineer Mine, Tagish Lake, British Columbia. Mineralogical Record, 27(4), 263-273.
Mark Mauthner & Carl A. Francis (2006) Gold Crystal localities of British Columbia, Canada, Rocks & Minerals, 81:1, 14-22, DOI: 10.3200/RMIN.81.1.14-22
Millonig, L.J., Beinlich, A., Raudsepp, M., Devine, F., Archibald, D.A., Linnen, R.L. & Groat, L.A. (2017). The Engineer Mine, British Columbia: An example of epithermal Au-Ag mineralization with mixed alkaline and sub alkaline characteristics. Ore Geology Reviews 83, 235–257.

Other Regions, Features and Areas containing this locality

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