mining Poldark's popularity sparks National Trust parking row in Cornwall Speed Read Decision to charge at site of Levant Mine disaster branded "insensitive" by locals Speed Read BHP Billiton gets tough as prices stay low In Depth Commodity prices are depressed, but cut-throat manoeuvres may keep the mining firm competitive By Daniel Coatsworth, Shares magazine Last updated 9 June 15 In Depth 1 2