OTCPK:NGELF - Post by User
Post by
realtyon Jan 05, 2019 10:59am
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Post# 29189856
Geology at Cortez - Similar to Hole 5
Geology at Cortez - Similar to Hole 5The main stratigraphic units within the Cortez mine area are as follow: * Siluro-Devonian, Roberts Mountains Formation, about 300 m thick - laminated, black, silty, graptolite-bearing limestone. The upper part is a thinly laminated, dark grey to light grey, dolomitic siltstone, calcareous siltstone and silty limestone that contain some carbon and locally show scour, graded bedding and cross-bedding. Pyrite cubes and aggregates of cubes less than 6 mm across occur throughout the unit and show no genetic relationship to igneous bodies or mineralised areas. Generally the most abundant pyrite is within the coarser grained silty layers. The pyrite grains are euhedral and much coarser than the silt grains, indicating that they are diagenetic (Wells, etal., 1969). https://www.portergeo.com.au/database/mineinfo.asp?mineid=mn1169 Realty