Stryhas, and two co-authors produced this NI 43-101 Technical Report in 2019 on vanadium properties in north-central Nevada in Elko County, seven air miles south of Carlin, Nevada. The Carlin Vanadium Property is located on the western flank of the Piñon Range, a block faulted horst of the Basin and Range tectonic province. The local lithologies are predominantly Paleozoic age (Permian to Mississippian), western assemblage, siliceous sedimentary rocks, shale, siltstone, chert, limestone and conglomerate, transported above the Roberts Mountain Thrust. These are overlain by Tertiary age rhyolite flows and Pliocene lake sediments.
The vanadium mineralization is stratigraphically controlled and appears to follow the strike and dip of the host lithology, near the contact between an overlying grey-brown siltstone and an underlying brown to black shale unit of the Devonian-age Woodruff Formation. The mineralized zones form stratigraphic sub-units or beds of the Woodruff Formation shale hosting elevated concentrations of vanadium in the form of vanadium pentoxide (V2O5). There are no visual sulfides indicating vanadium mineralization. The only visual distinctions in the lithology which indicate areas of elevated vanadium grades or mineralization from the unmineralized host shale is a color change from medium brown to black, reflecting an increase of carbon in the form of kerogen in the shale. All the mineralized zones are defined by chemical analysis. Drilling to date has defined multiple zones of vanadium-enriched mineralization (>0.2% V2O5) both in the overlying grey-brown siltstone and brown-black shale unit. The most persistence, thick and highest grade vanadium unit lies in the brown-black shale unit and averages approximately 115 ft (35 meters (m)) thick, striking north-south over 6,000 ft (1,800 m) in length and 2,000 ft (600 m) wide in the east-west direction.
Although most of the deposit is flat to very shallow dipping, it appears to be gently folded anticlinally, with dips locally east and west up to 30°. The mineralization is locally exposed at surface but mostly at a shallow depth to 200 ft (60 m) from surface. Parts of the sequence and deposit are oxidized and exhibit red-purple color in higher vanadium grades.
UCC began exploration in September 1966 and continued for the next two years. The work included surface mapping, trenching and sampling and was accompanied by auger and rotary drilling. A total of 17.8 line miles of road building and 3.3 line miles of caterpillar trenching and sampling were completed on the property. One hundred twenty seven (127) rotary drill holes totaling 31,095 ft (9,478 m) were completed by the end of 1967 on the property.
First Vanadium completed aerial surveys that generated orthophotos, mapping and core and reverse circulation drilling in 2017-2018. The drilling of 89 holes totaling 20,521 ft (6,255 m) confirmed historical drilling, infilled and expanded the deposit and collected material for metallurgical testing. Results of these drilling programs were applied to the current Mineral Resource Estimate.
[Read the complete report via the link provided above.]
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