RNS....what it says.....14 Mar 2011 10:22
SIMBERI GOLD MINE, PNG
172% INCREASE AT BOTLU DEPOSIT - TO 429, 000 oz
Allied Gold advises that Resource definition drilling at Allied Gold's 100% owned Simberi gold mine in Papua New Guinea has led to a 271,000 ounce increase in Inferred Mineral Resources Botlu deposit.
The estimated Measured and Indicated resources at Simberi now stand at 80.4Mt @ 1.26g/t Au, containing 3.26 Moz gold, with additional Inferred Resources of 91.9 Mt @ 1.00g/t Au containing 2.95 Moz gold (see Appendix 1 below).
A newly updated Mineral Resource of predominantly sulphide mineralisation has increased the estimated Inferred Resources at Botlu to 8.4 Mt at a grade of 1.59 g/t Au for 429,000 ounces gold as at February 2011. This represents an increase of 172% from previous total Measured, Indicated and Inferred Resources of 3.4 Mt @ 1.44g/t Au containing 158,000 ounces gold. (ALD - Revised NI 43-101 Technical Report, 9/11/2010).
RESOURCE ESTIMATION METHOD
The table reports resources in Oxide using a 0.5g/t Au block grade cut-off and in Transition and Sulphide using a 1.0g/t Au block grade cut-off.
The resource estimate is based on results from 165 drill holes totaling 14,950m drilled (29 core holes / 6,142m, 96 RC drill holes / 5,002m and 40 aircore holes / 3,805m). In addition to previous work, the database incorporates the results of a 15 hole / 3,174m core drilling programme, undertaken between June and December 2010.
The holes provide 13,230 analysed samples. Four core holes / 250m, drilled for metallurgical purposes prior to the previous resource estimate in 2003, were not assayed. Pierce points in the modelled parts of the 4 wire-framed domains range up to 75 metres apart down dip and 25 metres along strike. Drill hole sample assays were composited to 3m, providing 4,977 data values inside the modelled area. Seventeen composite average grades were cut to 10g/t Au, prior to block grade interpolation using the Inverse Distance Squared (ID2) algorithm. Block sizes in the model were 10m x 10m x 10m (parent cell) to 5m x 5m x 5m (sub-cell). The search ellipse used ellipse was 50m along strike, 50m down dip and 12.5m in the minor axis.
QUALITY CONTROL
Allied Gold employs a QA/QC protocol on all aspects of the analytical procedures currently undertaken. Core is logged, cut and sampled at the secure Simberi core logging facility. Core is generally sampled on a one metre basis, with half of the core is crushed, split to approximately 1.5kg and pulverised at the adjacent Exploration Sample Preparation Facility. The pulverised sample is sent for analysis by fire assay/AAS finish at ALS Laboratory in Townsville or Aqua Regia Digest/AAS finish at the dedicated Exploration Analytical Laboratory on-site. One half of the generally HQ core (PQ and limited NQ core sized core is also used) is restored to the core box for future reference. A blank sample is inserted every 40th sample and CRM standard samples, repres
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