Te Aroha Silver and Gold Mining Company, Lim. INTERESTING PARTICULARS RESPECTING COST OF TREATING ORES.

Te Aroha News, Volume VII, Issue 422, 23 November 1889, Page 2

Te Aroha Silver and Gold Mining Company, Lim. INTERESTING PARTICULARS RESPECTING COST OF TREATING ORES.

Through the courtesy of Mr W. Adams, acting local Manager for the above Company since Mr Howell left for Australia, we nre enabled to give our readers the following particulars, made up to date, of the cost of treating ore at the Company's Waiorongomai reduction works : Treatment of Sjuoiotjs Customs Ores and Company's ConceictrateB at thb Waiorongomai Reductions Works from 18tu Sept. to Not. Ist, 1889.

CfiUSHINO AKD CoNCEKTIUTINa £ 8, d. To Pny Sheet, Labour ... 643 Oil „ 4 Flasks Quicksilver .., 40 0 10 „ Freight on M'scl's SuppUea 16 6 9 „ MiHcellnneous Supplies 42 5 5 „ Blacksmith's Slack ... ♦ 6 9 11 „ Oil, Screen, eto. ... 43 8 0 „ Total expenditure from Jan. 12th to Nov, Ist, 1889 791 IX 10 Contra Cr. £ s, d. By Milling Charges for treatment of sundry Jots of Customs ores 28 12 7 Bv Supplies on hand, "approximately ... 60 0 0 88 12 7 To net cost of treatment 453G| tons ore 702 10 3

Summary of Prodjcts. 4488 Tons Company's ore, produced 155t5c lqr 101b concentrutes, assay value 3206 2 10 48 ,2-£ th tons Qustoms ores,pvo-

duced It oc2qr 7lh oonoen- ' trates, assay value 15 12 0 Or 453G.2-sth tons ore produced 156t lie 3qr 171b concentrates, assay value 3221 14 10 Add s per cent for difference "I in Thames und London > 184 2 0 market rates ) „, .. AssayvalueoUSGt lie 3qr 171b . concentrates 3405 16 10 ' Cost of crushing and concentrating, i about 3b per ton of crude ore treated, and about £4 lGs Gd for the ton of concentrates produced. Note, above returns of concentrates values, does not include the bullion retnrnn for amalgam caught in the ordinary way on the Battery plates, nor the subsequent trpntment of tailings at the Milling Plant, Desulphurizing and, Roasting or Conoen TRATEB IN THE HoWELfc TuBUIiAR C/YIJNDEtt Bbvolvino Fubnacb, j Pay Sheet, Labour »,. 11 16 11 44 Tons Fire Wood ... 12 2 0 Totaljcost of deßalphuriaing 156t. lie. 3qr. 171b. concentrates 23 18 11 Or about 3s per t°n af concentrates treated, and about lsd per ton of crude ore from which said concentrates were pro*, duced. Cindering ov Concentrates Lead akd j Silicious Cttstoms Ores in the Beyehberbatory furnace. £ 8. d.j To. Pay Sheet, Labour .., 2-52 5 7 „ Furnace Tools .„ ... 1 15 9 „15 Tons Fine Coal ... 18 10 2 „ 93 Tons oidinary Coal.., 9i 5 9 „ 245} Tona Firewood ... 81 12 1 0 Total Expendituve „< 445 9- 3 QO.NTRA Clt. By 4 Tons Coat sent to Mines 4 10 0 To N»t Expenditure to date 440 19 3 O«k Treatment Memorandum. T. c. qr.'.b. 156' 11 3 17 Concentrates 257 0 0 0 Broken Hill Lead Ores 103 18 320 Silidi<iud Customs Ores 517 10 3 9 Ore and Concentrates treated in the Rcverberntory Furnace nt oo^t of £440 19s 3d ; or equal to •about 17s por ton cindered. SMRLTIN» OF CIKDERKD CONCENTRATES AND Silicious Customs Orks at the YYahsm; Jacket Smelting Furnace. £ s. cl. £ s. d. ; To SGTons Limestone 73 811 •Less 24 Tons on hand 18 0 0 55 8 11 To 1 1 t. 5c. 2qr. 91b. Fluor Spar 9 0 G „ Labour 35ft 10 7 „ Scrap Iron ... 74 15 7 Less approximately on hand 10 0 0 G4 15 7 T0140.18-20t'naCoko20G G 7 Less 4 TonH on hand 8 0 0 288 6 7 To Miscellaneous Freights .„ 3 0 & M „ Supplies ... 5 1& 10 To Net axpendltura .„ 785 19 8 Coni-ua Cit. By tivatinont eh irKes foi sundry Customs Ore, pioducts ot Concentrates 3 17 To not foptof Smeltin<?sl7t. 10c. 3qr^9!l>.Oio and Concentrato* 73*2 18 1 Or equal to about £1 10s 4d per ton smelted. Summary ok Kxpknoiturks. For Account Ciushiu^ x\iv\ Concentrating ... .„ 702 19 3 Half charged em-h to Smelting account, an<t to. Buttery Plates Am;»lgnm«tii)n account 351 9 7^ For Account D 'sulphurising ami Roust in sr, Unwell furnace 2-3 18 11 „ Cindering, Kcverberatory Furnace „ 4+o 19 3 „ Smelting, Water Jacket Furnace 782 18 1 Co<<t of treatment 517t 10c. 3qr. 9H>s. Ore nml Conc< ntrates £1599 5 10^ Or equal to about £3 Is 10d per tou for the Ciushingand Concentrntinpr, Roa««tin^. Cindering, and Smelting 1 ; and equal to £2 8* 2il, for Roasting, Cindering, and Smelting only. The Water Jacket Furnace was charged on the 18th September, and continued running at intervals until November Ist, during which time the furnace wao under charge and tap for 30 dayp, trfating an average of 2Q& tons per day of 24 hours. The highest assay of 6lag f rent the tap was gold, nil ; silver, loz. I2d. 16g ; lead, 10 percent, Watkr Jacket Smemku Becobd&, T. c. qr. Ib. To 156 It 3 17 concentrates, assay value 3405 16 10 To 357 0 0 0 lead ore, assay value 2699 6 7 Less TOGO 0 0 lead ore on hand 713 15 0 1985 II 7 To 10318 3 20silicious Customs Ore at purchase pi ice 1G77 II 6 Add margin to make total assay value do. 763 6 0 2440 17 6 To base bullion from Tailings Plant 622 19 2 „ base bullion bought of old Battery Co, 15 0 0 " £8470 5 I Contra Cn. By 125t 9c3qr 2Tlb Auriferous Silver Lead Bullion (shipped ♦o London 8258 3 II Estimated value of lead well, etc., on hand 100 0 0 j Total products £8358 3 II . Or equal to a saving of about 99i per cent of the assay value of all ores, concentrates, and base bullion treated.