Knockstone

Knock'stone` noun (Mining) A block upon which ore is broken up.
Found on http://www.encyclo.co.uk/webster/K/16

knockstone

<chemical> A block upon which ore is broken up. ... Source: Websters Dictionary ... (01 Mar 1998) ...
Found on http://www.mondofacto.com/facts/dictionary?knockstone

Knockstone

• (n.) A block upon which ore is broken up.
Found on http://thinkexist.com/dictionary/meaning/knockstone/
No exact match found