Published on May 19, 2015 Mark Learmonth, chief financial officer of Caledonia Mining (LON:CMCL), says the company now press ahead ‘much more aggressively’ with its underground drilling at the Blanket mine in Zimbabwe. It follows a resource upgrade at its 49%-owned gold mine. 491,000 ounces of gold have now been moved into the higher confidence ‘indicated’ resource category from ‘inferred’. Learmonth says following a management shake-up last year, the new executives recognised the need to ‘show the market that we are putting effort into resource development which means over time increasing the resource base and increasing the confidence of that resource base’.