Denham Capital Management-backed biomass company Big Island Carbon LLC, which sought to produce energy from macadamia nutshells in Hawaii, has filed for chapter 7 to liquidate its assets, Dow Jones DBR Small Cap reported today. The company claimed $16.8 million in debt, composed of $11.4 million in secured debt owed to Kona Investment Holdings, a $5 million secured loan from Synergy Bank and $395,000 in unsecured claims. It has $23.5 million in assets, according to court documents, including $22.7 million worth of equipment used to process the shells.