The heavily tattooed Mr. Dinnison wears a $5,000 crucifix and proudly calls himself a Cub—"cashed-up bogan." ("Bogan" is Australian slang for a blue-collar worker.)MANDURAH, Australia — One of the fastest-growing costs in the global mining industry are workers like James Dinnison: the 25-year-old high-school dropout from Western Australia makes $200,000 a year running drills in underground mines to extract gold and other minerals.