CSAMT Survey At Rimrock Property, Nevada Confirms Mineralization Model And Delineates Large Gold-Silver Target
LAS VEGAS, May 2, 2013 /PRNewswire/ -- Rimrock Gold Corp. (OTCQB: RMRK) (the "Company"), is pleased to announce that its geophysics consultant Wright Geophysics has provided the Company with an initial interpretation of the recently completed Controlled Source Audio Magnetotelluric ("CSAMT") geophysical resistivity survey on the Company's wholly-owned Rimrock gold-silver property in Elko County, Nevada. The Rimrock property is strategically located in a highly mineralized epithermal gold-silver district, 7 Km northwest of Rodeo Creek's Hollister mine, and 16 Km southeast of Newmont's Midas mine.
The survey covered 10.9 line Km east-west across the property, with four survey lines spaced 250 to 400 meters apart, encompassing all of the previously identified mineralization targets on the property. The CSAMT data were acquired using a 50 meter electric-field receiver dipole, and one CSAMT transmitter, of a grounded dipole configuration. Initial interpretations of the CSAMT survey validate the mineralization model developed by the Company's technical team, and include the following observations:
- The previously identified "Dilation" gold-silver target on surface along the major "IC Fault Zone" has been verified at depth by the survey.
- The siliceous mineralization associated with the "Dilation" target has been interpreted to be constrained by steeply dipping near-vertical fault zones.
- These fault zones are interpreted to be up to 150 meters in width, representing one of the widest gold-silver targets in the entire Midas-Hollister region, potentially hosting near-surface bulk-mineable gold mineralization.
- The location of older Paleozoic basement rocks has been identified to be between 275 and 375 meters below surface, confirming the mineralization model developed by Company geologists.
The Paleozoic basement is likely part of the siliceous "Upper Plate" Vinini Formation package that lies beneath surface volcanic rocks, and above the Roberts Mountain Thrust fault package that separates the Vinini from "Lower Plate" sedimentary rocks. This "Lower Plate" sedimentary unit is known to host the large Carlin-style gold deposits situated further south at the Goldstrike-BlueStar-Carlin mine complex. The Paleozoic rocks at Rimrock are believed to have been domally uplifted to the surface, immediately west of the property boundary. As a result, the mineralized layer with Carlin-style gold potential could be much closer to the surface at Rimrock than at Hollister or at Midas. An updated evaluation of the northwest extension of the Carlin trend has been recently completed, and the Rimrock project is interpreted to lie directly in the heart of this projection of the prolific gold-bearing trend.
Overall, the new CSAMT data appear to provide a much clearer basis for defining the presence, geometry, and depth extensions of the northerly-trending structures at Rimrock that contain opalite-cinnabar (mercury sulfide) mineralization. The Company is continuing to further interpret the survey data, with the help of Wright Geophysics. The final interpretations will be used to design new exploration drillholes at Rimrock.
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