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Seventy-four per cent, of the coal produced in the Dominion during 1927 was broken down by permitted explosive, and the average production of coal per pound of explosive used was 3"71 tons, and per shot fired 3-00 tons. (b) List of Mines required by Law to use Permitted Explosives. The following is a list of mines as at the 31st December, 1927, required by law to use permitted explosives : — Northern Inspection District. Pukemiro Collieries, Pukemiro —throughout South Mine. Rotowaro Colliery, Rotowaro —throughout No. 1 and No. 3 Mines. Glen Afton Colliery, Glen Afton —all sections of the mine, with the exception of A section. Waikato Extended Colliery, Huntly- -all sections. West Coast Inspection District. North Cape Mine, Puponga. Reddale, Reefton (Woodlands, Empire, LishPuponga, Puponga. man's). Stone's, Takaka. Reefton Coal Co.'s, Reefton. O'Rourke's, Murchison. Waitahu Colliery, Reefton. Bennett, Blair, and McDonald's. Seddonville. White Rose, Morrijigs. Zealandia, Seddonville. Armstrong's, Dunollie. Cardiff Bridge, Seddonville. Baddeley's, Runanga. Celtic, Seddonville. Bellevue, Runanga. Chester's, Seddonville. Blackball Coal Co.'s, Blackball. Clydevalc, Seddonville. Brae Head, Dunollie. Coal Creek, Seddonville. Cain's, Rapahoe. Dove's, Seddonville. Castle Point, Runanga. Glen Lea. Seddonville. Dobson, Brunnerton. Glasgow, Seddonville. Duggan's, Rewanui. Harris, Karamea. Hunter's, Dunollie. Murray's, Seddonville. Manderson's, Runanga,. Quinn and party's, Seddonville. Briandale, Ten-mile Barrytown Road (MoSt. Helens, Seddonville. Neill's). Rogers Bros., Seddonville. Moody Creek, Dunollie. Westportmain, Granity. Old Runanga Co-operative party, Rewanui. Westport-Mokihinui, Seddonville. Schultz Creek, Runanga. Westport Coal Co.'s, Denniston mines. Scott and Kerry's, Twelve-mile, Barrytown Westport Coal Co.'s, Millerton mines. Road. Westport-Stockton, Ngakawau. Smith's, Runanga. Wynn's, Seddonville. Spark's, Rewanui. Rocklands, Berlin's. State Coal-mines (Liverpool Collieries and Whitecliffs, Berlin's. James Colliery). Archer's, Capleston. Paparoa, Roa. Caliope, Reefton. Wafer's, Runanga. Clele, Merrijigs. Wallsend, Brunnerton. Coghlan's, Capleston. Allan's, Brunnerton. Collins and Kearns, Reefton. Dennehy's, Barrytown Road. Dorans, Capleston. New Point Elizabeth, Dunollie. Morrisvale, Reefton (Perfection Valley and Matchless). Southern Inspection District. Castle Hill Mine, Kaitangata. Birch wood Mine, Ohai. Kaitangata No. 1 Mine. Linton Mine, Ohai. Kaitangata No. 2 Mine. Oahi Coal Company's mine, Ohai. Wairaki Mine, Ohai. (c) List of Mines required by Law to use Safety-lamps. The following is a list of the mines as at the 31st December, 1927, required by law to use safetylamps :— Northern inspection District. Pukemiro Colleries, Pukemiro—Main north heading section (now abandoned). Rotowaro Colliery, Rotowaro —Throughout No. 1 and No. 3 Mines. Glen Afton Colliery, Glen Afton—No. 1 heading section. West Goast Inspection District. Westport Coal Co.'s (one section, Millerton Spark's, Rewanui. Mine). State Mine (Liverpool No. 2) Oobson, Brunnerton. Paparoa, Roa. Hunter's, Dunollie. Wallsend, Brunnerton. Manderson's, Runanga.