By Stanis Bujakera and Aaron Ross KINSHASA (Reuters) – More than $400 million in tax advances and loans that Democratic Republic of Congo’s state mining company Gecamines said it paid to the national treasury cannot be found, according to a report by the government’s public finances watchdog. State miner Gecamines holds minority stakes in several of the world’s largest copper and cobalt projects, including Glencore’s Kamoto Copper Company mine and China Molybdenum’s Tenke Fungurume mine. Gecamines has long been dogged by accusations of corruption made by non-governmental organisations and oppo…