Location: The Ibex Saddle prospect (Maas, 1995, p. 233, 235, 245) is in the south part of Section 1 at an elevation of about 4500 feet, adjacent to the west margin of a small lobe of Texas Glacier at the head of Ibex Creek. The location is accurate within about 0.1 mile.
Geology: The country rocks in the area of the Ibex Saddle prospect are pelitic metasedimentary and subordinate andesitic volcanic strata of the Jurassic or older Mesozoic Hazelton Group, which is underlain and locally intruded by the Triassic Texas Creek Granodiorite; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1997; Koch, 1996). Maas and others (1995, p. 235, 245) describe the deposit as sulfide-bearing silicified[?] andesite. The sulfides are pyrite, galena, and sphalerite. Samples of the deposit collected by the U.S. Bureau of Mines in 1992 or 1993 contain up to 656 ppb Au, 40.7 ppm Ag, 2705 ppm Cu, 2.6% Pb, and 7.5% Zn. Lead-isotope studies of galena from the Ibex Saddle prospect (Maas and others, 1995, p. 235) indicate that the deposit is Jurassic in age, contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).
Workings: Samples of the deposit collected by the U.S. Bureau of Mines in 1992 or 1993 (Maas and others, 1995, p. 245) contain up to 656 ppb Au, 40.7 ppm Ag, 2705 ppm Cu, 2.6% Pb, and 7.5% Zn.
Age: Lead-isotope studies of galena from the Ibex Saddle prospect (Maas and others, 1995, p. 235) indicate that the deposit is Jurassic in age, contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).
Alteration: Andesite hostrock is silicified and impregnated with sulfide minerals.

Commodities (Major) - Ag, Pb, Zn
Development Status: None
Deposit Model: Polymetallic veins

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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

ⓘ Lead

ⓘ Silver

ⓘ Zinc

Mineral List

4 valid minerals.

Detailed Mineral List:

ⓘ Galena

Formula: PbS

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

ⓘ Pyrite

Formula: FeS₂

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

ⓘ Quartz

Formula: SiO₂

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

ⓘ Sphalerite

Formula: ZnS

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Galena	2.CD.10	PbS
ⓘ	Pyrite	2.EB.05a	FeS₂
Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂

List of minerals for each chemical element

O	Oxygen
O	ⓘ Quartz	SiO₂
Si	Silicon
Si	ⓘ Quartz	SiO₂
S	Sulfur
S	ⓘ Galena	PbS
S	ⓘ Pyrite	FeS₂
S	ⓘ Sphalerite	ZnS
Fe	Iron
Fe	ⓘ Pyrite	FeS₂
Zn	Zinc
Zn	ⓘ Sphalerite	ZnS
Pb	Lead
Pb	ⓘ Galena	PbS

Other Databases

Link to USGS - Alaska:	BC084

Other Regions, Features and Areas containing this locality

North AmericaContinent

Coast MountainsMountain Range

North America PlateTectonic Plate

StikiniaVolcanic Arc
Taku DomainDomain

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References

Alldrick, D.J., 1993, Geology and metallogeny of the Stewart mining camp, northwestern British Columbia: British Columbia Department of Mines and Petroleum Resources Bulletin 85, 105 p., 2 plates, scale 1:50,000. Koch, R.D., 1996 [In press), Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report, 1 sheet, scale 1:250,000. Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p. Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p., 1 plate.

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