Original sentence: , a prospecting firm hired by Diamond Fields Resources Inc..  This deposit is considered to be one of the most substantial mineral discoveries in Canada in the last 40 years and is estimated to contain 141 million tonnes at 1.6% nickel.Currently the mining rights for the Voisey's Bay nickel deposit belong to the Toronto-headquartered Vale Inco company, a subsidiary of CVRD, the largest mining and metals company in the Western Hemisphere.Since the discovery of the Voisey's Bay deposit, efforts have been stepped up to find similar deposits in coastal Labrador
Edited sentence: , a prospecting firm hired by Diamond Fields Resources Inc.. This deposit is considered to be one of the most substantial mineral discoveries in Canada in the last 40 years and is estimated to contain 141 million tonnes at 1.6% nickel.Currently the mining rights for the Voisey's Bay nickel deposit belong to the Toronto-headquartered Vale Inco company, a subsidiary of Vale.Since the discovery of the Voisey's Bay deposit, efforts have been increased to find similar deposits in coastal Labrador