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Geology
- Property Geology -
Alteration
In the aforementioned intrusive stocks, quartz-bearing veinlets typically have a biotite halo that grades into chlorite/epidote. Given the chemical inertness of the quartzites and arenites, silicification is the most apparent alteration encountered therein; the finer-grained siltstones and red beds are hornfelsed variably to biotite-, actinolite-, epidote-, and diopside-bearing rocks.
Mineralized intrusive rocks are variably affected by potassic K-Feldspar (PK) and potassic Biotite (PB) alteration. Minor sericitic (SER) alteration has been noted locally as haloes on quartz veinlets. Late “Pararani” dykes typically exhibit propylitic (PRO) to chloritic (CHL) alteration, as do rocks outside the main area of mineralization. Argillic (ARG) alteration is well developed in rocks affected by the supergene leached cap; especially the feldspar-bearing intrusive rocks. The quartzites and finer-grained sedimentary rocks exhibit variably degrees of silicification (SIL). Many of the finer-grained sedimentary rock sequences exhibit biotite-, actinolite-, epidote-, and diopside-bearing hornfels (HORN). Minor intercalations of limey sedimentary rocks have been converted to garnet- and diopside-bearing skarns (SKA) with magnetite, pyrrhotite and chalcopyrite. A very well-developed supergene weathering profile has created a leached cap consisting of Fe-Oxide ± Mn-Oxide (FeOx/MnOx); locally penetrating to depths of 200m below the surface.
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