Back holes

From WebRef.org
Revision as of 15:16, 3 November 2020 by Webref (talk | contribs) (Created page with "In shaft sinking, raising, or drifting, the holes that are shot last. Source: Dictionary of Mining, Mineral, and Related Terms")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigationJump to search http://www.onegreatfamily.com

In shaft sinking, raising, or drifting, the holes that are shot last.

Source: Dictionary of Mining, Mineral, and Related Terms


Sponsor: Save up to $435.00 on ClickMeeting MyWebinars PRO Annual up to 20% off 500 attendees - The most affordable webinars on the market. Upgrade your account today!

SHOP.COM  - Give Layered Jewelry for Valentine's Day