Location: Nye Co., T11N, R39E, Union Mining District
The landmark prospect is located on the west edge of the Shoshone Mountains of Nye County, a basin-range uplift covered by Mesozoic carbonates. The wet flank of this uplift hosts the Union Mining District, which is divided into two segments, the Ione-Berlin district near Ione to the north and the Grantsville district near Grantsville and Milton canyon (the area of the Landmark prospect) to the south.The Ione-Berlin area is noted for production of several thousand tonnes of silver and gold ores from veins and shear zones in volcanics and carbonates rock near small Tertiary intrusive stocks, with minor production of base metals from one mine. Further south, at Grantsville, a mine producing silver, lead and zinc from replacements in Triassic limestone was in intermittent operation beginning in 1863 until the mid-1940s. The aggregate production was 50,000 tonnes with grades of 5.0 oz/t silver and 0.8% lead and 2% zinc.
The north northwesterly-trending Shoshone thrust is the dominant structural feature of the Landmark prospect. The stratigraphy is disturbed in the vicinity of the thrust: the upper plate Luning Formation limestones are upside down and the lower plate shaley calcareous siltstones and silty limestones of the Sunrise/Gabbs are overturned. High-angle, post-thrust, normal faults displace both upper and lower plate rocks.Two sets of these faults have been identified. One set strikes northeast and offsets the Shoshone Thrust; the other strikes northeast also, but only offsets the Sunrise/Gabbs Formation.
Hydrothermal alteration and mineralization found at the Landmark prospect is extensive, and consists of the following subtypes; extensive jasperoid development in the upper plate Luning Formation, becoming pervasive along the Shoshone thrust; fluorite occurring as veins and pods in silicified Luning Formation, and disseminated in jasperoid bodies; stibnite occurring as blebs and remnant casts of stibnite laths, 3-6” long, in jasperoids along the Shoshone Thrust; traces of cinnabar and molybdenite at two jasperoid localities along the Shoshone Thrust; and anomalous gold (up to 0.034 oz/t) silver (up to 0.09 oz/t), arsenic (up to 1,000 ppm), and antimony (up to 10,000+ ppm) in rock and soil samples along the Shoshone thrust.
Although no current resource or reserve estimate has been defined on the project, the silty calcareous units within the Sunrise/Gabbs Formations appear to be a potential host for disseminated gold. The area is also structurally complex providing many conduits for auriferous fluids to penetrate the rock. Nevada Select is presently utilizing historic data as well as its own field work to develop new targets on the property.
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