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"Biomass for energy often mean plant base material although can equally apply to both animal and vegetable draw from material. Biomass is actually a biological material derive form living or recently living organisms. Biomass chemical composition is carbon based and is composed of a mixture of organic molecules containing hydrogen, usually including atoms of oxygen, often nitrogen and also small quantities of other atoms, including alkali, alkaline earth and heavy metals, metals are often found in functional molecules such as the porphyrins which include chlorophyll which contains magnesium. There are five basic categories of material of biomass such as: *Virgin wood- from forestry, arboriculture activities or from wood processing. *Energy crops- high yield crops grown specifically for energy applications *Agricultural residues- residues from agriculture harvesting or processing * Food waste- from food and drink manufacture, preparation and processing, and post-consumer waste *Industrial waste and co-products- from manufacturing and industrial processes."

Crown Capital Management International Relations Deputy Energy and Mineral Resources Minister Susilo Siswo Utomo also said a government probe into the tunnel collapse should end in one or two months. Arizona-based Freeport suspended operations at the world's No. 2 copper mine on May 15, a day after the training tunnel, away from its main operations, fell in on 38 workers. Several investigations are being conducted into the accident at the Grasberg mine complex, including one by the Energy and Mineral Resources Ministry and one by Freeport Indonesia using international experts. Susilo told reporters on Monday the open-pit production would restart in the immediate future and there was no reason for it not to resume as the investigation was not being done in the production area. The Grasberg mine normally produces around 220,000 tonnes of concentrated ore a day, with around 140,000 tonnes coming from open-pit mining and 80,000 tonnes from underground operations. Some industry analysts say the mine could face a prolonged closure and further strain relations between Freeport and trade unions after a three-month strike there in late 2011. Freeport Indonesia could not be contacted by telephone on Monday. On Saturday, as many workers carried out maintenance work, a Freeport spokeswoman said any restarting of operations would depend on the outcome of underground safety inspections being carried out by the energy and mineral resources ministry. A union official at Freeport Indonesia reiterated that all investigations into the cause of the collapse must be completed before mining resumes at the Grasberg complex, which also holds the world's largest gold reserves. "The union welcomes the management's decision to resume maintenance activities in Grasberg open-pit mining, but not for production activities," Papua-based union leader Virgo Solos