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Occurrence Details


Occurrence Number
116K 005
Occurrence Name
Alto
Occurrence Type
Hard-rock
Status
Deposit


General Information

Primary Commodities: iron
Deposit Type(s): Iron Formation
Location(s): 66.523610 N, -140.279720 W
NTS Mapsheet(s): 116K09
Location Comments: .5 Kilometres
Hand Samples Available at YGS: Yes

Capsule

Work History

Discovered before 1973 by a joint venture between Inexco Mg C (Int. Nuclear OCL), Amoco Can. Pet. CL, Arrow Inter-America and Husky OL. First staked as Rio iron cl (YA2823) and Alto cl (YA2914) in Oct/75 by Rio Alto EL, which added Yeti cl (YA2962) in Feb/76, performed mapping and sampling later in the year, added the Moose cl (YA10820) and prepared a topographic map in 1977. Rio Alto performed road building, trenching and mapping in 1983.
Restaked as Tr0g cl 1-432 (YB88193) by Eagle Plains Resources Ltd in Jul/96.

Capsule Geology

Oolitic magnetite occurs in a 46 m thick bed that is exposed for a length of 366 m at the contact between clastic rocks of the Permian Jungle Creek Formation and recessive black shale of the Jurassic and Lower Cretaceous Kingak Formation. The magnetite is dark grey to black, massive and dense and weathers into rusty, angular fragments. The oolites are closely packed, commonly flattened with their long dimensions as much as 1 mm, and are locally replaced by goethite and hematite. The company estimatedt reserves of at 27,200,000 tonnes grading 55% Fe.

Location Map

Last Updated: May 10, 2018

Work History

Year Work Type Comment
1983 Development, Surface: All Weather Road
1983 Geology: Bedrock Mapping
1983 Trenching
1977 Geology: Bedrock Mapping
1976 Geochemistry: Soil
1976 Geology: Bedrock Mapping

Regional Geology - Terrane

Group: Ancestral North America
Affinity: W Laurentia
Name: North America - platformal strata
Realm: Laurentia


Regional Geology - Bedrock

Supergroup:
Group/Suite:
Formation: Ettrain
Member:
Terrane: Laurentia
Period Max: Carboniferous
Age Max: 331 MA
Period Min: Carboniferous
Age Min: 300 MA
Rock Major: siltstone/sandstone/limestone
Rock Minor:
Reference: Norris (1981) - GSC Map 1522A
Geological Unit (1M): CE
Geological Unit (250K): CE

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
094242 2001 Geological Report on the Rusty Springs Property Rock - Geochemistry
090158 1976 Geology of the Rusty Springs Mineral Prospect, Porcupine Ranges, Yukon Territory Rock - Geochemistry, Soil - Geochemistry, Detailed Bedrock Mapping - Geology, Handblast - Trenching

Related References

Number Title Page(s) Document Type
Citations
Norris, D.K. (ed), 1997. The geology, mineral and hydrocarbon potential of northern Yukon Territory and northwestern District of Mackenzie. Geological Survey of Canada, Bulletin 422.
Norris, D.K., 1976. Structural and Stratigraphic Studies in the northern Canadian Cordillera; Norris, D K; in, Report of Activities Part A. Geological Survey of Canada, Paper no. 76-1A, p. 457-466.
Norris, D.K., 1980. Geology, northern Yukon Territory and northwestern District of Mackenzie. Geological Survey of Canada, Open File 715.
Schael, G., 1978. Geology and genesis of the Rusty Springs Zn-Pb-Cu-Ag Prospect, Porcupine Range, Y.T. Unpublished BSc thesis, University of Western Ontario.

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