General Information
Secondary Commodities: copper, antimony
Deposit Type(s): Porphyry Alkalic Cu-Au
Location(s): 62.243890 N, -137.127220 W
NTS Mapsheet(s): 115I03
Location Comments: 1 Kilometres
Hand Samples Available at YGS: No
Capsule
Work History
Staked as the MJK cl (Y78884) in May 1974 by the Carmacks Synd (Castlemaine EL, Welcome North ML, W.M. Bath Inv L and Ventures West Capital L) and optioned in June to a joint venture between Western ML, Cream Silver ML and Belmoral ML, which carried out grid soil sampling and a magnetic geophysical survey later in the year.
Re-staked as Boo cl (YB7740) in August 1987 by Doron E Inc., which transferred them to B. Harris in September 1994. In 1994, Midnight Mines (a Harris owned company) carried out prospecting and rock sampling on the Boo and surrounding claims.
Geology & Mineralization
The area is characterized by large intrusive Jurassic monzonite bodies of the Long Lake Suite overlain by Cretaceous andesite to basalt of the Mount Nansen Suite (Allan & Friend, 2018; Carlson, 1987). Cretaceous units of the Carmacks Casino Formation have been mapped to the southeast by Colpron et al. (2007).
The claims were staked on airborne magnetic targets for their magnetite-gold skarn potential. They cover granitic and syenitic intrusions cut by quartz-feldspar porphyry dykes and are partially overlain by mafic volcanic rocks. Geochemical response was weak with only a few isolated Cu and Sb values above threshold.
Midnight Mines exploration program was focused on finding gold bearing stockwork bodies and gold-quartz veins similar to those found at the Caribou vein (MINFILE occurrence 115I 049) located 1 km northwest. The area surrounding the actual occurrence received only a cursory examination and no samples were collected.
Staked as the MJK cl (Y78884) in May 1974 by the Carmacks Synd (Castlemaine EL, Welcome North ML, W.M. Bath Inv L and Ventures West Capital L) and optioned in June to a joint venture between Western ML, Cream Silver ML and Belmoral ML, which carried out grid soil sampling and a magnetic geophysical survey later in the year.
Re-staked as Boo cl (YB7740) in August 1987 by Doron E Inc., which transferred them to B. Harris in September 1994. In 1994, Midnight Mines (a Harris owned company) carried out prospecting and rock sampling on the Boo and surrounding claims.
Geology & Mineralization
The area is characterized by large intrusive Jurassic monzonite bodies of the Long Lake Suite overlain by Cretaceous andesite to basalt of the Mount Nansen Suite (Allan & Friend, 2018; Carlson, 1987). Cretaceous units of the Carmacks Casino Formation have been mapped to the southeast by Colpron et al. (2007).
The claims were staked on airborne magnetic targets for their magnetite-gold skarn potential. They cover granitic and syenitic intrusions cut by quartz-feldspar porphyry dykes and are partially overlain by mafic volcanic rocks. Geochemical response was weak with only a few isolated Cu and Sb values above threshold.
Midnight Mines exploration program was focused on finding gold bearing stockwork bodies and gold-quartz veins similar to those found at the Caribou vein (MINFILE occurrence 115I 049) located 1 km northwest. The area surrounding the actual occurrence received only a cursory examination and no samples were collected.
Location Map
Last Updated: Jun 1, 2020
Work History
| Year | Work Type | Comment |
|---|---|---|
| 1994 | Geochemistry: Rock | |
| 1994 | Other: Prospecting | |
| 1974 | Geochemistry: Soil | |
| 1974 | Ground Geophysics: Magnetics | |
| 1974 | Other: Prospecting |
Regional Geology - Terrane
Group: Intermontane
Affinity: W Laurentia
Name: Yukon-Tanana
Realm: peri-Laurentian
Regional Geology - Bedrock
Supergroup:
Group/Suite: Long Lake
Formation:
Member:
Terrane:
Period Max: Jurassic
Age Max: 188 MA
Period Min: Jurassic
Age Min: 183 MA
Rock Major: monzonite
Rock Minor:
Reference: Allan & Friend (2018) - YGS OF 2018-2
Geological Unit (1M): EJL
Geological Unit (250K): EJyL
Assessment Reports that overlap occurrence
| Report Number | Year | Title | Worktypes | Holes Drilled | Meters Drilled |
|---|---|---|---|---|---|
| 061084 | 1974 | Geological, Geochemical and Geophysical Report on the Mjk 1-32 Claims, Freegold Mountain | Soil - Geochemistry, Bedrock Mapping - Geology, Magnetics - Ground Geophysics, Line Cutting - Other |
Related References
| Number | Title | Page(s) | Document Type |
|---|---|---|---|
| 2018-2 | Bedrock geological map of the Mount Freegold district, Dawson Range | Open File (Geological - Bedrock) | |
| 1987-2(G) | Geology of Mt. Nansen (115I/3) and Stoddart Creek (115I/6), Dawson Range, Central Yukon | Open File (Geological - Bedrock) | |
| 2007-6 | Geology of the northern Whitehorse trough, Yukon (105E/12, 13 and parts of 11 and 14; 105L/4 and parts of 3 and 5; parts of 115H/9 and 16; 115I/1 and part of 8) | Open File (Geological - Bedrock) |
| Citations |
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