According to the Mines and Geosciences Bureau, the province has mineral reserves including: gold, copper, magnesite, manganese, iron, limestone, marble, sandstone, red burning clay, mactan stone, serpentine, and gravel. Of these minerals, only sand, gravel, and red burning clay are being used. The rest of these resources remain as reserves and potential for exploration. A mining company, Benguet Exploration, used to operate in Pinut-an, San Ricardo but it did not renew its permit when it expired in the early 1990s.