An important factor in this context is that, in order to allow companies to recoup a portion of the equipment costs most countries allow mines to claim large depreciation deductions in the early years of a project (Otto 2000).
一个重要的相关因素是，为了允许公司收回部分设备成本，大多数国家允许公司在项目头几年进行大量折旧扣减(Otto, 2000)。