Sunstone Metals (ASX: STM) has made a substantial gold-silver discovery called Limon in southern Ecuador, drilling and trenching has established high grade mineralisation, the next big drilling programme is about to start any day to test below these trenches. The company aims to establish a substantial open pit operation at Limon, which will then lead into a far bigger project at the Bramaderos Project next door, sunstone has a market capitalization of just $42 million.