Centurion reports initial drill results from its Badak mining site
Tuesday, November 8 2011 - 02:07 AM WIB
The company is testing the gold-copper-molybdenum anomalous surface rock samples along the north-western margin of the Nareh volcanic-intrusive complex.
It said it has now completed two drill holes on the epithermal gold target in the Nareh volcanic complex with a third underway.
Hole NA_DDH 5 was ended at a depth of 200 m, the maximum capacity of the drill rig and it intersected narrow mineralized zones registering 3m @ 0.6 g/t Au and 0.15 % Cu from 5 m, and 1 m @ 0.96 g/t Au from 158 m, albeit rock channel samples in this area assayed up to 1 m @ 11 g/t Au as previously reported. Consequently the company is re-examining the nature of the mineralization.
Hole NA_ DDH 6, collared at approximately 120 m north of hole NA_DDH 5 and directed toward the southwest, was terminated at a depth of 180 m. This hole was designed to test the continuity of the mineralization to the west and southwest. Assays are pending.
Hole NA_DDH 8 (in progress) is collared approximately 75 m higher in elevation than NA_DDH 6 and is aimed at intersecting a potential near surface, high-grade gold zone. Seven rock chip samples in this area returned assays from 0.1 to 2.2 g/t Au.
Banda Raya Property
Exploration crews have been able to establish initial drill targets on the Banda Raya property. Previously, the company reported a geological and geochemical survey that resulted in delineating a 5-km radius gold-copper mineralization complex. This property hosts epithermal, gold-polymetallic and porphyry copper-gold prospects.
Rock assay results from targeted mineralized areas, including, a newly uncovered epithermal gold lode system that so far has been traced for 300 m long and up to 5 m wide, are being compiled and will be reported shortly. This lode remains open at both ends. The company anticipates relocating one of two drill rigs currently under contract to the project area.
Once logistics, drill pads and infrastructure are in place, Centurion will implement a focused drill program on these prospects, it said.
The sample chain of custody is managed by Centurion Minerals under the supervision of Thomas Mulja and/or exploration manager Thomas Dott. Core samples are picked up from the drill site at the end of every shift by Centurion personnel for direct delivery to the secured drill core storage house located next to Centurion regional office in the town of Takengon. The storage is accessible only by approved personnel.
Intervals of core to be analyzed are split with a mechanized core cutter in half with one half to be sent to the laboratory for geochemical analysis and the remaining half to be kept in the storage for future reference and uses. Samples to be assayed will remain under the control of Centurion personnel until shipped or delivered to Intertek Testing and Inspection Services preparation laboratory in the city of Medan,
North Sumatra that is responsible for pulverization of the samples. The pulps are then forwarded directly by Intertek personnel to the Intertek Analytical Laboratory in Jakarta.
Intertek is ISO 90001 and 17025 accredited and employs a Laboratory Information Management System for sample tracking, quality control and reporting. In addition to Intertek internal standard materials and blank samples, Centurion regularly inserts into every sample batch its own certified rock standards from OREAS and GEOSTATS, Australia, and field duplicate samples.
Gold is determined with fire assay methods (FA 50), and other elements with Induced Coupled Plasma-Optical Emission Spectrometry (ICP-OES; Intertek Codes: IC01 and IC50). Intertek systematically re-assays selected low, high, and over-limit results. (romel)