Mining has become the leading source of foreign exchange in Zimbabwe, with gold accounting for one third of exports, but political turmoil, lack of energy and an unfavourable regulatory environment has led to several mines closing. The government is presently working on a new mining law aimed at compliance with modern standards for the extractive industries, in order to receive funding from the World Bank. The law will introduce a “use it or lose it” policy in respect of all existing mining claims, and will make provision for the re-evaluation of mining contracts in Zimbabwe.