Blackham Resources Ltd. said Oct. 12 that it expects the Wiluna North open pits at its Wiluna/Matilda gold operation in Western Australia to span 3.5 kilometers, after completing an updated resource estimate.
The updated estimate outlined open pit indicated resources totaling 6.2 million tonnes grading 2.6 g/t of gold, with open pit inferred resources estimated at 1.1 million tonnes grading 3.4 g/t of gold.
The analysis covers the Happy Jack, Bulletin, Squib, Essex, Golden Age North and Starlight deposits.
Contained gold in the indicated and inferred categories is estimated at 630,000 ounces. The estimate uses cutoff grades of 0.5 g/t of gold for oxide and 1.0 g/t of gold for transitional and fresh material and incorporates data from about 23,000 meters of drilling completed between March and May.
Blackham noted that open pit resources at Wiluna now total 16.9 million tonnes grading 2.8 g/t of gold for 1.5 million ounces.
Measured, indicated and inferred open pit resources at Wiluna/Matilda are estimated at 40 million tonnes at 2.1 g/t of gold for 2.8 million ounces, while measured, indicated and inferred underground resources at the overall project are estimated to total 24 million tonnes grading 4.8 g/t of gold for 3.7 million ounces.
Updated pit designs and reserves estimates are underway.
"This large open pit resource and reserves underpin the growth opportunity as seen in the expansion pre-feasibility study released late in August," Bryan Dixon, the company's managing director, commented.