General Information
Primary Commodities: iron, silica, phosphorus
Deposit Type(s): Iron Formation
Location(s): 65.252220 N, -133.039440 W
NTS Mapsheet(s): 106F06
Location Comments: .5 Kilometres
Hand Samples Available at YGS: Yes
Capsule
Work History
Hematite float in glacial till was well known for years (Geological Survey of Canada Paper 50-14) before the source was discovered by California Standard Company Ltd in 1961. A total of 862 claims (an area of about 240 sq km) were staked in Jun/62 and transferred to a new subsidiary company, Crest Exploration Ltd, which carried out geological mapping, channel sampling, ground and airborne geophysical surveying and drilled one hole (106.7 m) in 1962. In 1963 the company continued channel sampling, carried out bulk sampling, drilled 18 holes (2 549.3 m) and constructed an airstrip.
In addition, the entire property was surveyed and taken to lease and a feasibility study was carried out by Canadian Bechtel Ltd in 1963-64, and two bulk samples totaling about 110 tonnes were shipped out for metallurgical tests. Sometime in the late 1970¿s to early 1980¿s the property was transferred to Chevron Resources Canada.
In Apr/2002 Promithian Inc, the Nacho Nyak Dun Development Corporation and the Yukon Department of Energy Mines and Resources engaged Hatch Associates Ltd to carry out a high level evaluation of Promithian's plan for developing the Crest Iron deposit into a mining-steel manufacturing operation. In Jul/2006 Chevron Resources Canada Ltd commissioned Hatch Consulting Ltd to review the economics of the Crest Iron deposit.
Capsule Geology
Iron formation composed of unaltered hematite and jasper occurs near the base of the glacial-marine Rapitan Formation of Late Proterozoic age. Thickness is up to 152 m and average iron content is 43% and ranges as high as 65%. Thin layers with primary sedimentary features suggest that chemical deposition of alternating silica and hematite rich layers was interrupted by the influx of flows of conglomerate and mud, which scoured channels in the soft iron and silica sediment. Some of the fine grained clastic beds impregnated with hematite have the appearance of tuff or volcanic ash that settled in soft hematitic ooze.
The hematite and silica are believed to have been carried in solution by fumarolic waters and precipitated in grabens on the sea floor. Phosphorous is the main impurity, occurring as finely disseminated apatite.
In May/64 mineable reserves in the Iron Creek area (zones 1 to 9), employing a less than 1:1 stripping ratio, were estimated at 3 175 147 000 tonnes, averaging 43.8% iron, 26.6% silica and 0.34% phosphorous (Assessment Report #017964 p. 5). In 1986 Yeo published a reserve figure of 5.6 billion tonnes averaging 47.2% iron for the central part of the Crest deposit (see also Assessment Report #091697 p. 18). Regional reserves are estimated at over 18.5 billion tonnes.
References
CANADA NORTH, Sep/62. Giant ore find brings new hope to the north. P. 9-10.
CHEVRON CANADA RESOURCES SNAKE RIVER IRON ORE REVIEW, by C. McBean, Hatch Consulting Ltd. Available from promithian.citymax.com website.
CREST EXPLORATION LTD, Jun/62. Assessment Report #061478 by R.M. Williams.
CREST EXPLORATION LTD, Jun/63. Assessment Report #091697 by R.J. Flower.
CREST EXPLORATION LTD, May/64. Assessment Report #017964 by R.J. Flower.
CREST EXPLORATION LTD, Nov/65. Assessment Report #019058 by J.L. Charles.
CREST EXPLORATION LTD, Nov/65. Assessment Report #019059 by D. Miller.
CREST EXPLORATION LTD, Nov/65. Assessment Report #019060 by A.R. Rule and C.B. Daellenbach.
CREST EXPLORATION LTD, Nov/65. Assessment Report #019093 by P. Boutin.
CREST EXPLORATION LTD, 1965. Assessment Report #019094 by J.E. Lawver.
DAHLSTROM, C.D.A., Apr/72. The Snake River Iron Deposit. Talk presented to Fourth Northern Resource Conference, Whitehorse.
DAHLSTROM, C.D.A., 24 Sep/64. Crest Exploration. Northern Miner, p. 83.
GEOLOGICAL SURVEY OF CANADA Paper 50-14, p. 23-24; Paper 63-38, p. 15-18; Paper 64-36, p. 16-17; Paper 65-1A, p. 143; Paper 65-19, p. 22-23.
KLEIN, C. AND BEUKES, N.J., 1993. Sedimentology and geochemistry of the glaciogenic late Proterozoic Rapitan Iron Formation in Canada, Economic Geology and the Bulletin of the Society of Economic Geologists, May 1993, Vol. 88, No. 3, p. 542-565.
NORRIS, D.K., ET AL., 1993. The geology, mineral and hydrocarbon potential of the Northern Yukon Territory and Northwestern District of Mackenzie. Geological Survey of Canada Memoir, in press.
PROMITHIAN INC., Jun/2005. Web Site: www.promithian.citymax.com.
YEO, G.M. 1986. Iron-formation in the late Proterozoic Rapitan Group, Yukon and Northwest Territories. : In Mineral Deposits of the Northern Cordilleran, Canadian Institute of Mining and Metallurgy, Special Volume 37 by J. A. Morin.
Hematite float in glacial till was well known for years (Geological Survey of Canada Paper 50-14) before the source was discovered by California Standard Company Ltd in 1961. A total of 862 claims (an area of about 240 sq km) were staked in Jun/62 and transferred to a new subsidiary company, Crest Exploration Ltd, which carried out geological mapping, channel sampling, ground and airborne geophysical surveying and drilled one hole (106.7 m) in 1962. In 1963 the company continued channel sampling, carried out bulk sampling, drilled 18 holes (2 549.3 m) and constructed an airstrip.
In addition, the entire property was surveyed and taken to lease and a feasibility study was carried out by Canadian Bechtel Ltd in 1963-64, and two bulk samples totaling about 110 tonnes were shipped out for metallurgical tests. Sometime in the late 1970¿s to early 1980¿s the property was transferred to Chevron Resources Canada.
In Apr/2002 Promithian Inc, the Nacho Nyak Dun Development Corporation and the Yukon Department of Energy Mines and Resources engaged Hatch Associates Ltd to carry out a high level evaluation of Promithian's plan for developing the Crest Iron deposit into a mining-steel manufacturing operation. In Jul/2006 Chevron Resources Canada Ltd commissioned Hatch Consulting Ltd to review the economics of the Crest Iron deposit.
Capsule Geology
Iron formation composed of unaltered hematite and jasper occurs near the base of the glacial-marine Rapitan Formation of Late Proterozoic age. Thickness is up to 152 m and average iron content is 43% and ranges as high as 65%. Thin layers with primary sedimentary features suggest that chemical deposition of alternating silica and hematite rich layers was interrupted by the influx of flows of conglomerate and mud, which scoured channels in the soft iron and silica sediment. Some of the fine grained clastic beds impregnated with hematite have the appearance of tuff or volcanic ash that settled in soft hematitic ooze.
The hematite and silica are believed to have been carried in solution by fumarolic waters and precipitated in grabens on the sea floor. Phosphorous is the main impurity, occurring as finely disseminated apatite.
In May/64 mineable reserves in the Iron Creek area (zones 1 to 9), employing a less than 1:1 stripping ratio, were estimated at 3 175 147 000 tonnes, averaging 43.8% iron, 26.6% silica and 0.34% phosphorous (Assessment Report #017964 p. 5). In 1986 Yeo published a reserve figure of 5.6 billion tonnes averaging 47.2% iron for the central part of the Crest deposit (see also Assessment Report #091697 p. 18). Regional reserves are estimated at over 18.5 billion tonnes.
References
CANADA NORTH, Sep/62. Giant ore find brings new hope to the north. P. 9-10.
CHEVRON CANADA RESOURCES SNAKE RIVER IRON ORE REVIEW, by C. McBean, Hatch Consulting Ltd. Available from promithian.citymax.com website.
CREST EXPLORATION LTD, Jun/62. Assessment Report #061478 by R.M. Williams.
CREST EXPLORATION LTD, Jun/63. Assessment Report #091697 by R.J. Flower.
CREST EXPLORATION LTD, May/64. Assessment Report #017964 by R.J. Flower.
CREST EXPLORATION LTD, Nov/65. Assessment Report #019058 by J.L. Charles.
CREST EXPLORATION LTD, Nov/65. Assessment Report #019059 by D. Miller.
CREST EXPLORATION LTD, Nov/65. Assessment Report #019060 by A.R. Rule and C.B. Daellenbach.
CREST EXPLORATION LTD, Nov/65. Assessment Report #019093 by P. Boutin.
CREST EXPLORATION LTD, 1965. Assessment Report #019094 by J.E. Lawver.
DAHLSTROM, C.D.A., Apr/72. The Snake River Iron Deposit. Talk presented to Fourth Northern Resource Conference, Whitehorse.
DAHLSTROM, C.D.A., 24 Sep/64. Crest Exploration. Northern Miner, p. 83.
GEOLOGICAL SURVEY OF CANADA Paper 50-14, p. 23-24; Paper 63-38, p. 15-18; Paper 64-36, p. 16-17; Paper 65-1A, p. 143; Paper 65-19, p. 22-23.
KLEIN, C. AND BEUKES, N.J., 1993. Sedimentology and geochemistry of the glaciogenic late Proterozoic Rapitan Iron Formation in Canada, Economic Geology and the Bulletin of the Society of Economic Geologists, May 1993, Vol. 88, No. 3, p. 542-565.
NORRIS, D.K., ET AL., 1993. The geology, mineral and hydrocarbon potential of the Northern Yukon Territory and Northwestern District of Mackenzie. Geological Survey of Canada Memoir, in press.
PROMITHIAN INC., Jun/2005. Web Site: www.promithian.citymax.com.
YEO, G.M. 1986. Iron-formation in the late Proterozoic Rapitan Group, Yukon and Northwest Territories. : In Mineral Deposits of the Northern Cordilleran, Canadian Institute of Mining and Metallurgy, Special Volume 37 by J. A. Morin.
Location Map
Last Updated: Jul 3, 2014
Work History
| Year | Work Type | Comment |
|---|---|---|
| 2006 | Studies: Preliminary Economic Assessment | Hatch, July 2006. Review of Crest Deposit. |
| 2002 | Studies: Feasibility | Hatch Associates hired to carry out high level evaluation. |
| 1964 | Studies: Feasibility | |
| 1963 | Drilling: Diamond | Number of holes drilled: 18 Amount of work done: 2549.3 METRES |
| 1963 | Geochemistry: Rock | Amount of work done: 110 TONNES |
| 1963 | Other | |
| 1963 | Studies: Feasibility | |
| 1962 | Drilling: Diamond | Number of holes drilled: 1 Amount of work done: 106.7 METRES |
| 1962 | Geology: Bedrock Mapping |
Regional Geology - Terrane
Group: Ancestral North America
Affinity: W Laurentia
Name: North America - platformal strata
Realm: Laurentia
Regional Geology - Bedrock
Supergroup: Windermere
Group/Suite: Rapitan
Formation: Shezal
Member:
Terrane: Laurentia
Period Max: Cryogenian
Age Max: 716 MA
Period Min: Cryogenian
Age Min: 700 MA
Rock Major: siltstone/diamictite/iron formation
Rock Minor:
Reference: Norris (1982) - GSC Map 1529A
Geological Unit (1M): uPR
Geological Unit (250K): uPR2
Assessment Reports that overlap occurrence
| Report Number | Year | Title | Worktypes | Holes Drilled | Meters Drilled |
|---|---|---|---|---|---|
| 017964 | 1963 | Summary Report of Operations on the Yukon Iron & Mica Claims Snake River Area | Air Strip - Development, Surface, Diamond - Drilling, Soil - Geochemistry, Regional Bedrock Mapping - Geology | 18 | 2549.30 |
| 091697 | 1963 | A Continued Study of the Beneficiation Characteristics of Iron Ore from the Snake River Iron Ore Deposit | Magnetic - Airborne Geophysics, Rock - Geochemistry, Soil - Geochemistry, Gravity Survey - Ground Geophysics, Magnetics - Ground Geophysics |
Related References
| Number | Title | Page(s) | Document Type |
|---|---|---|---|
| ARMC013558 | The Snake River iron deposit - Notes on a talk to the Yukon Northern Resource Conference | Report | |
| ARMC013556 | Notes on Snake River area | Report | |
| ARMC013562 | News clipping - Major iron discovery | News Release | |
| ARMC013561 | Notes on Crest iron ore | Miscellaneous Company Documents | |
| ARMC013560 | Snake River area structural cross sections | Geoscience Map (General) | |
| ARMC013559 | Snake River iron deposit 1963 field program summary report | Report | |
| ARMC013563 | Drilling areas - Snake River project | Geoscience Map (General) |
| Citations |
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