The National Environment Board has rejected the environmental impact assessment (EIA) report on a controversial potash mine in Udon Thani and ordered the firm investing in the project to add more information on environmental and social impacts that the multi-billion-baht underground mine operations could cause... [The] mining company, Asia Pacific Potash Corporation (APPC) [part of Asia Pacific Resources], threatened to sue the government if the project is not approved within two years time, as it has already invested heavily in the mining project.