Gold cyanidation ban  A gold cyanidation ban refers to the legislation that bans mining gold through the gold cyanidation technique. Germany, Czech Republic, Hungary and Costa Rica have such bans, as well as the US states of Montana and Wisconsin and several Argentine provinces. A number of Argentine provinces banned cyanide mining, but there is no ban at the federal level. In 2002, Costa Rica passed a moratorium on open-pit cyanide-leach mining. The US state of Montana banned open pit heap leaching and vat leaching using cyanide for gold mining following a citizen's initiative, Initiative 137, proposed by the Montana Environmental Information Center that was approved through a referendum on November 6, 1998. The law was codified in MCA 82-4-390. In the "Seven Up Pete Venture v. State" case, the Supreme Court of Montana found that the ban does not constitute a violation of the Contract Clause of the US Constitution. The US state of Wisconsin banned in 2001 the usage of cyanides for mining or ore processing. The Summit, Costilla, Gunnison, Conejos and Gilpin counties in Colorado banned cyanide mining. However, the Colorado Supreme Court ruled in "Colorado Mining Association v. Board of Commissioners of Summit County" that the counties, as subdivisions of the state, may not ban chemicals allowed by the Colorado Mined Land Reclamation Act. The voters of Lawrence County, South Dakota voted for a local ordinance banning new permits for surface mining on public land in a national forest. This was meant to ban extraction of gold and silver in the Spearfish Canyon area of the Black Hills National Forest. The courts decided in the "South Dakota Mining Association Inc. v. Lawrence County" that the federal law (which encourages exploration, mining and extraction of valuable minerals) overrides county regulations. The European Parliament voted in 2010 a motion for a resolution urging the European Commission to initiate a complete ban of cyanide mining, however the European Commission refused to propose legislation to implement such a ban. Janez Potočnik, European Commissioner for Environment, argued that a ban would not be "justified from environmental and health point of views" and that closing down gold mines using cyanides in Europe would be "detrimental to employment". In 2002, the Czech Parliament decided to ban gold cyanide leaching. In 2006, Germany established a gradual reduction of allowed cyanides in mining. In December 2009, the Hungarian Parliament voted for a complete ban of cyanide mining in the country following a campaign organized by the "Cyanide-Free Hungary!"