Talk:List of deepest mines

How is depth measured?
Is measured from the mine entrance,  or from sea level? This should be clarified in the list criteria. Hadron137 (talk) 01:45, 3 September 2018 (UTC)
 * The Empire Mine mentions an of $3,400 m$. How does incline depth compare to depth below the surface? Hadron137 (talk) 03:56, 3 September 2018 (UTC)
 * Also, Deep sea mining techniques have mined $3,700 m$ below sea level. Should these mines be included as examples of "deepest mines"? Hadron137 (talk) 03:56, 3 September 2018 (UTC)

List criteria
There is some ambiguity about what this list includes. Is this only for active mines, or non-operational mines too? What if they have filled with water, collapsed, or otherwise sealed? A paragraph to specify inclusion criteria is needed. The criteria should also specify a minimum depth for this list, otherwise it's open-ended. Is there a significant depth that should be used, like an accepted geologic boundary or historic example? Hadron137 (talk) 02:32, 3 September 2018 (UTC)
 * It should also be made clear that bore holes and oil wells aren't included. Hadron137 (talk) 03:43, 3 September 2018 (UTC)
 * ✅. I added my best effort at an inclusion criteria. Please feel free to edit/modify as appropriate. Hadron137 (talk) 00:03, 11 September 2018 (UTC)

Another U.S. Mine (2016)
Hecla Mining's "Lucky Friday #4", 2.92 km, at https://me.smenet.org/webContent.cfm?context=1&webarticleid=1986

01:02, 6 September 2022 (UTC) 2601:8A:C180:70:B156:BEDF:F5CF:20D0 (talk) 01:02, 6 September 2022 (UTC)