The financial payoff from a new minerals deal between Ukraine and the U.S. is likely to take a decade or longer as investors face many hurdles to getting new mines into production in the war-ravaged country. Developing mines that produce strategically important minerals in countries with established mining sectors such as Canada and Australia can take 10 to 20 years, mining consultants said on Thursday. Summary Minerals deal between US, Ukraine won't bear fruit for years Threats posed by war with Russia will deter many investors Challenges also include poor data, damaged power infrastructure Russia occupies territory where several deposits...