** Miner's U.S.-listed shares up 7.1 pct at $2.42; Canadian shares up 7.4 pct at C$3.20
** Company hits back at hedge fund, Kerrisdale Capital, which called the company "worthless"
** Says claims have "numerous misstatements" and "deliberate inaccuracies"
** Kerrisdale, which is short on the stock, called capital costs to build Northern Dynasty's copper mine in Alaska "onerous" and commercially unviable
** Anglo American pulled out of the Pebble copper project in 2013, while Rio Tinto gave away its 19.1 pct stake in Northern Dynasty in 2014
** Up to Monday's close, the company's U.S.-listed stock rose more than fourfold, but lost 40 pct of those gains after the claims were made on Tuesday