Dear Mr. Gleason,
Thank you for posting your request on History Hub!
The history of iron mining in Rockaway Township dates back to the 18th century before declining in the middle 20th century. The most famous and productive mines were the Hibernia Mine and the Mt. Hope Mine, though there were other active iron mines in the region.
We searched the National Archives Catalog and located the Field Station Correspondence Files, 1951 in the Records of the U.S. Bureau of Mines (Record Group 70) that pertain to Mt. Hope. For more information about these records, please contact the National Archives at College Park - Textual Reference (RDT2) at email@example.com.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
We suggest you review the brief history of mining and related resources at the Rockaway Township Free Public Library local history page. The New Jersey Department of Environmental Protection hosts a page of free online publications pertaining to New Jersey geological resources including a history of iron mining and a map archive of abandoned mines.
We also suggest you contact the New Jersey State Archives for any records they may have in their custody.
We hope this is helpful. Best of luck with your research!