Mining began in the 1920s though minerals are not a significant contributor to Burundi's economy, accounting for less than 1% of GDP. Among other minerals, mining in Burundi yields tungsten, tin, tantalum and niobium and possesses resources of nickel, uranium and rare earths. The mineral and petroleum industry is mostly stagnant due to poor infrastructure and transportation, as well as a civil war which ended in 2005. Many studies into mineral extraction feasibility have occurred, including gold lodes near Myinga and alluvial gold deposits in the northwest. Nickel laterite has been found near Musongati that could yield 30,000 mt/a of ore.