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The Hydrometallurgical Processing Plant (HPP) project was proposed in 2000 by CBNC and RTNMC to process low-grade nickel ore stored in the company’s open dumpsites. The HPP is an industrial enclave consisting of a hydrogen sulfide plant, limestone quarrying operation and support facilities such as causeway and coal power plant. Both limestone and hydrogen sulfide are needed in the nickel refining process. The limestone will be quarried from Mt. Gotok located in Barangay Iwahig, Municipality of Bataraza which is within the ancestral domain of the Pala’wan indigenous community. Hydrogen sulfide, on the other hand, will be processed out of the sulfuric acid imported from Japan.