|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Beta Complex is an elongate ultramafic-mafic complex. The center is located about 3.0 miles north of the junction of Round Triangle Lake and Long Triangle Lake, about 3.0 miles west-southwest from VABM 5715, and about 0.2 mile northwest from the center of section 11, T. 21 S., R. 9 E., of the Fairbanks Meridian. The location accuracy is estimated to be within 1.5 miles of the center.|
Geologic descriptionThe Beta Complex is a Nickel-Copper-Platinum Group Elements (Ni-Cu-PGE) prospect in a series of mafic-utramafic intrusive complexes that are part of the Wrangellia Terrane (Pure Nickel, 2011; Findlay, 2013). It was formerly part of Pure Nickel Inc.’s MAN Project (Lisa Buchan, Corporate Secretary and Business Manager, Pure Nickel Inc., oral communication, 2014). The region is known for the Nikolai Greenstone; associated are ultramafic-mafic intrusions cogenetic with overlying Triassic Nikolai basalt. These intrusions characteristically weather to an orange-brown color, are generally serpentinized in tectonized zones, and may contain chromiferous magnetite, chromite, and/or disseminated sulfides (Ellis, 2002).
|Geologic map unit||(, )|
|Mineral deposit model||Disseminated Ni-Cu-PGE in gabbro (Cox and Singer, 1986; model 5b).|
|Mineral deposit model number||5b|
|Age of mineralization||Triassic, about 230 Ma (Findlay, 2013).|
|Alteration of deposit||Serpentinization (Stone, 2005).|
|Workings or exploration||
From 1991 to 1997, this area was explored by American Copper and Nickel Company (ACNC) working with Fort Knox Gold Resources, Inc. Their work included drilling, surface UTEM, and borehole and EM on three holes. From 1997 to 2003, the area was explored by Nevada Star Resource Corp (US), whose work included a geological mapping program in addition to an AEM survey over the northern and southern portion of the project area. From 2004 to 2005 the area was briefly explored by Anglo American Exploration (USA). Their work included geological mapping, prospecting, and a soil geochemical sampling survey (Pure Nickel Inc., 2014).
In 2005, Nevada Star Resources Corp., resumed work and completed a 35-kilometer TEM survey over a four loop area, 177-kilometer ground magnetometry, and 1057 soil samples over general MAN Project area (Pure Nickel Inc., 2014).
In 2007, Pure Nickel gained control of the leases, and it is now 100 percent owned by them, after a joint venture partnership with ITOCHU Corporation of Japan from 2008 to 2013. During this partnership, approximately 23.5 million US dollars were spent on exploration at the general MAN Project area (Pure Nickel Inc., 2014).
In 2008, the field program by Pure Nickel focused on diamond drilling, which targeted geophysical anomalies, including VTEM conductors, in the Beta Complex. The drilling intercepted wide zones of disseminated sulfides, including 0.50 meter grading 1.39 percent nickel and 1.27 percent copper (Pure Nickel Inc., 2008).
Pure Nickel’s 2009 field program included four drill holes in the southern Beta Complex. Interpretation of 2D modeling of 2009 ZTEM data and previous 3D inversions of aeromagnetic data, as well as several widely spaced deep drill holes indicate thick ultramafic bodies with localized deep feeders (Pure Nickel Inc., 2009).The 2010 exploration program executed by Pure Nickel on the Beta Complex included three drill holes in the southern Beta complex. Drill results highlights include 1.1 meters of 1.76 percent copper; 8 meters of 202.7 parts per billion (ppb) platinum + palladium; 11 meters of 150.6 ppb platinum + palladium; and 1.14 meters of 835.5 ppb platinum + palladium (Findlay, 2013).
|Indication of production||None|
Additional commentsIn 2007, Pure Nickel gained control of the leases, and it is now 100 percent owned by them, after a joint venture partnership with ITOCHU Corporation of Japan from 2008 to 2013. During this partnership, approximately US$23.5 million was spent on exploration at the general MAN Project area (Pure Nickel Inc., 2014).
Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p.
Findlay, J., 2013, An Overview of Pure Nickel Inc.'s MAN and Salt Chuck Exploration Projects in Alaska, Pure Nickel Inc.: Alaska Miners Association, 2013 Annual Convention, Abstracts, p. 31.
|Reporters||V.C. Zinno (Alaska Earth Sciences, Inc.)|
|Last report date||3/15/2016|