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(...continued) However, by 1882, Bilsby had become unable to maintain a market for ore and the Manganese Iron Ore Company went bankrupt. In 1887, the renowned Edward Cooper and Abram Hewitt acquired the company's assets. Nonetheless, they apparently did not accomplish a lot of mining and in 1896 sold the mine to the Passaic Zinc Company. The following year, the Passaic Zinc Company was consolidated into the New Jersey Zinc Company.
From 1897 onwards, the New Jersey Zinc Company worked the entire parcel of Sterling Hill as a single mining operation. During this period, a powder magazine was added from inside the tunnel and electric lighting. In 1986, the mine was permanently abandoned and the tunnel entrance capped. Three years later, the mine was acquired by Richard and Bob Hauck to become the Sterling Hill Mining Museum.
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