The Ohio DNR Division of Geological Survey has maps and data of
As well as dozens of reports and publications.
There’s lots more information on the ohiodnr.gov website about mining, including the ODNR Division of Mineral Resources’ “Citizen Resources” which includes a short history of coal in Ohio.
https://www.msha.gov/mine-data-retrieval-system
The US Department of Labor has a Mine Safety and Health Administration (MSHA) that publishes a Mine Data Retrieval system. If you scroll down you can search by mine name, state and county, contractor, controller and operator and get results for accidents, inspections, violations, employment and production and more.
The U.S. Energy Information Administration has its own “COAL DATA BROWSER” that shows data from the Annual Coal Report (downloadable in Excel format.) They also provide national data on petroleum, natural gas, renewables, nuclear and energy efficiently and consumption.
https://www.americangeosciences.org/critical-issues/mineral-resources
The American Geosciences Institute is a professional organization of geoscientists and their website has FAQs about national mineral resources including this rundown of US coal production.
The USGS has lots of national maps in their Mineral Resources Online Spatial Data page. You can search for Ohio but may need to know something about geology.
https://ohiomemory.org/digital/
Ohio Memory is a huge online digital collection that includes lots if visual primary resources. Coal subjects include:
DPLA will provide an even wider search scope.
https://chroniclingamerica.loc.gov/
There are 119,888 search results for “mining” in Ohio in this massive database of US newspapers.
Data.gov is an aggregator for the U.S. Government’s open data, which includes some of the above and much more.
(Special thanks to Nicholas Ver Steegh for this list)