Ricus Grimbeek. Chief Energy Metals, Jubilee Metals Group PLC ; PREVIOUS POSITION. President/CEO, Trevali Mining Corp. Trevali Mining Corp is a natural resource company engaged in the acquisition, exploration, development and production of mineral properties. Its operating segments are Perkoa mine (Burkina Faso), Rosh Pinah mine (Namibia) and Caribou mine (Canada). and Corporate and others. The company produces zinc concentrate from the Perkoa mine in Burkina Faso, and zinc and lead-silver concentrate from the Rosh Pinah mine in Namibia, the Caribou mine in New Brunswick and the Santander mine in Peru.