Frequently Asked Questions
Common questions about MinesNearMe.com, mine data, and what the information means for you.
What is the difference between USGS MRDS and MSHA data?
The USGS Mineral Resources Data System (MRDS) is a geological database cataloging mineral deposits, prospects, and occurrences identified through federal surveys. It includes historical mines dating back centuries. MSHA (Mine Safety and Health Administration) tracks mines regulated under federal safety law — primarily active and recently closed operations. MRDS is broader and more historical; MSHA is more current and operationally focused. We combine both to give the most complete picture.
What do the different mine statuses mean?
Active/Producer — Currently operating and regulated by MSHA. Past Producer — Was once operational but is no longer mining. The site may or may not be reclaimed. Abandoned — No longer in use and not maintained. May pose safety and environmental hazards. Abandoned and Sealed — Officially closed and sealed to prevent entry. Prospect — A location where minerals have been identified but no significant mining occurred. Occurrence — A geological record of mineral presence, not necessarily a mine site.
What does 'occurrence' mean in USGS data?
An occurrence is a location where a mineral has been identified through geological survey, sampling, or observation. It does not mean a mine was ever built or operated there — it simply indicates that the mineral exists at that location. Occurrences are useful for understanding regional geology and mineral potential.
Are the mine locations exact?
Mine coordinates come from federal databases and vary in precision. MSHA locations for active mines are generally accurate. USGS MRDS coordinates for historical mines may be approximate — sometimes placed at a town center or section corner rather than the exact mine entrance. Always verify on the ground before visiting any location.
Is it safe to visit an abandoned mine?
No. Abandoned mines are extremely dangerous. Hazards include unstable ground and cave-ins, toxic gases (including odorless ones like carbon monoxide), flooded shafts, rotting timbers, hidden vertical drops, and wildlife. Dozens of people die in abandoned mines every year. Many are also on private property. Never enter an abandoned mine without professional authorization and proper safety equipment.
How often is the data updated?
MSHA data is updated weekly and reflects current mine operational status. USGS MRDS is updated periodically as new geological surveys are completed. Our database is rebuilt from the latest federal sources on a regular basis. The last update date is shown in the sitemap.
I found a mine near a property I'm considering buying. Should I be concerned?
It depends on the mine's status, type, and distance. Active mines may produce noise, dust, and truck traffic. Abandoned mines can pose risks including ground subsidence, groundwater contamination, and radon gas from uranium-bearing deposits. A "prospect" or "occurrence" is generally not a concern. For specific properties, consider consulting your state geological survey, a local environmental consultant, or your county planning department.
Can I use this data for research or commercial purposes?
The underlying data comes from U.S. federal databases (USGS and MSHA) and is in the public domain. You are free to use the federal source data for any purpose. If you're conducting academic research or journalism, please cite the original federal sources.