Showing 29 items matching "ore bins"
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Bendigo Historical Society Inc.
Photograph - Napoleon Ore Bins, 1935
... Napoleon Ore Bins...Black and white photograph: framework for ore bins...Written in pencil on back of photograph : 'Erecting ore... : 'Erecting ore bins at Napoleon 27/8/56' Black and white photograph ...Significant to mining history of Bendigo.Black and white photograph: framework for ore bins at Napoleon (BML) Gold Mine, being erected alongside head frame at mine site. Trestle way visible in extreme top of image. Written in pencil on back of photograph : 'Erecting ore bins at Napoleon 27/8/56'napoleon gold mine, anticline -
Bendigo Historical Society Inc.
Photograph - Napoleon Ore Bins, 1935
... Napoleon Ore Bins.... Photograph Napoleon Ore Bins ...Significant to mining history of Bendigo.Black and white photograph: base of head frame with mine at top of shaft. Rail trcks in foreground.Written in pencil on back of photograph : 'Napoleon main shaft 2/9/35''napoleon gold mine, anticline -
Bendigo Historical Society Inc.
Photograph - AUSTIN COLLECTION: Wattle Gully Gold Mine, Chewton, 1982
... ore bins... with ore bins, poppet head and mining sheds. Eucalypt trees... Chewton ore bins poppet head mine sheds Black and white photograph ...Wattle Gully Mine holds a pivotal position in the history of the State's quartz mining industry. The rich strike at Wattle Gully mine in 1937 helped revive the State's gold mining industry that had been in the doldrums since the First World War. Wattle Gully, and a handful of other 'new' companies - the Maude and Yellow Girl, Morning Star, A 1, and North Deborah - were the flagships of the revived industry and sustained the State's gold production for some 30 years. Wattle Gully mine, with a yield of 350,000 ounces, was the richest mine of its era. By 1940, the Wattle Gully Company had paid out £207,000 in dividends to its shareholders. The company continued to mine profitably through the Second World War, though it struggled due to a shortage of manpower. After the war, the mine continued to develop - in the early 1950s new plant including a winding engine, steel poppet head, and twenty-head battery was added. The plant was obtained from the Central Nell Gwynne Company, Bendigo. On 13 March 1969, the Wattle Gully Company closed down the mine, laying off 62 men. Since 1970 Wattle Gully mine has worked intermittently. Recent additions to the mine's infrastructure has been a new ore processing plant and a decline tunnel. The ore processing plant was operated by Newmont mining from 1987 to 1990 and subsequently operated by Consolidated Victorian Mines and Duketon Goldfields. The mine site has retained evidence of its development since 1937 with its most recent periods of equipment upgrades in the 1950s and 1980s being documented by buildings, structures and intact and working machinery. Heritage Council Victoria: https://vhd.heritagecouncil.vic.gov.au/places/2380 Black and white photograph: view of Wattle Gully mine site with ore bins, poppet head and mining sheds. Eucalypt trees in centre of image. gold mining, underground, wattle gully gold mine, chewton, ore bins, poppet head, mine sheds -
Bendigo Historical Society Inc.
Photograph - AUSTIN COLLECTION: Wattle Gully Gold Mine, Chewton, 1980's
... ore bins... in background. Ore bins on left hand side of image.... mine sheds ore bins Black and white photograph: landscape view ...Wattle Gully Mine holds a pivotal position in the history of the State's quartz mining industry. The rich strike at Wattle Gully mine in 1937 helped revive the State's gold mining industry that had been in the doldrums since the First World War. Wattle Gully, and a handful of other 'new' companies - the Maude and Yellow Girl, Morning Star, A 1, and North Deborah - were the flagships of the revived industry and sustained the State's gold production for some 30 years. Wattle Gully mine, with a yield of 350,000 ounces, was the richest mine of its era. By 1940, the Wattle Gully Company had paid out £207,000 in dividends to its shareholders. The company continued to mine profitably through the Second World War, though it struggled due to a shortage of manpower. After the war, the mine continued to develop - in the early 1950s new plant including a winding engine, steel poppet head, and twenty-head battery was added. The plant was obtained from the Central Nell Gwynne Company, Bendigo. On 13 March 1969, the Wattle Gully Company closed down the mine, laying off 62 men. Since 1970 Wattle Gully mine has worked intermittently. Recent additions to the mine's infrastructure has been a new ore processing plant and a decline tunnel. The ore processing plant was operated by Newmont mining from 1987 to 1990 and subsequently operated by Consolidated Victorian Mines and Duketon Goldfields. The mine site has retained evidence of its development since 1937 with its most recent periods of equipment upgrades in the 1950s and 1980s being documented by buildings, structures and intact and working machinery. Heritage Council Victoria: https://vhd.heritagecouncil.vic.gov.au/places/2380 Black and white photograph: landscape view of Wattle Gully mine site. Eucalypt trees in foreground, mining sheds in background. Ore bins on left hand side of image.gold mining, underground, wattle gully gold mine, mine sheds, ore bins -
Bendigo Historical Society Inc.
Photograph - AUSTIN COLLECTION: Bill Williamson, 1980's
... ore bins... mine sheds ore bins Written on back of photo in blue pen: Bill ...Wattle Gully Mine holds a pivotal position in the history of the State's quartz mining industry. The rich strike at Wattle Gully mine in 1937 helped revive the State's gold mining industry that had been in the doldrums since the First World War. Wattle Gully, and a handful of other 'new' companies - the Maude and Yellow Girl, Morning Star, A 1, and North Deborah - were the flagships of the revived industry and sustained the State's gold production for some 30 years. Wattle Gully mine, with a yield of 350,000 ounces, was the richest mine of its era. By 1940, the Wattle Gully Company had paid out £207,000 in dividends to its shareholders. The company continued to mine profitably through the Second World War, though it struggled due to a shortage of manpower. After the war, the mine continued to develop - in the early 1950s new plant including a winding engine, steel poppet head, and twenty-head battery was added. The plant was obtained from the Central Nell Gwynne Company, Bendigo. On 13 March 1969, the Wattle Gully Company closed down the mine, laying off 62 men. Since 1970 Wattle Gully mine has worked intermittently. Recent additions to the mine's infrastructure has been a new ore processing plant and a decline tunnel. The ore processing plant was operated by Newmont mining from 1987 to 1990 and subsequently operated by Consolidated Victorian Mines and Duketon Goldfields. The mine site has retained evidence of its development since 1937 with its most recent periods of equipment upgrades in the 1950s and 1980s being documented by buildings, structures and intact and working machinery. Heritage Council Victoria: https://vhd.heritagecouncil.vic.gov.au/places/2380 Black and white photograph: former miner from Castlemaine, Bill Williamson, leaning on a shovel, reading newspaper clippings pinned on trifold noticeboard. One notice ' Bendigo Advertiser, 'Gold protest dig aims to strike it rich'. Photo probably taken near Chewton.Written on back of photo in blue pen: Bill Williamson, old miner from Castlemaine, (mined through depression yrs) gold mining, underground, wattle gully gold mine, mine sheds, ore bins -
Bendigo Historical Society Inc.
Document - CENTRAL NELL GWYNNE BLUEPRINT
... Blueprint drawing of Central Nell Gwynne front of ore bins... of Central Nell Gwynne front of ore bins & centre uprights by T J ...Blueprint drawing of Central Nell Gwynne front of ore bins & centre uprights by T J Jorgensen & Son Engineers. J J Stanistreet Manager.T J Jorgensen & Sonmine, gold, central nell gwynne -
Bendigo Historical Society Inc.
Slide - ALBERT RICHARDSON COLLECTION: SPECIMEN HILL, EAGLEHAWK
... , mullock heaps, ore bins.... head, chimney stack, mullock heaps, ore bins. Slide ALBERT ...Slide. Specimen Hill, Eaglehawk, west of Sailor's Gully Road. Image taken about 1906. Poppet head, chimney stack, mullock heaps, ore bins.No. 22 on bottom of slidemine, gold, specimen hill (eaglehawk )., bendigo mines-jack hattam collection -
Bendigo Historical Society Inc.
Photograph - MINE WINDER HOUSE
... , ore bins, chimney and shed. Residences adjacent to mine..., ore bins, chimney and shed. Residences adjacent to mine ...Black and white photograph. Mine winder house, poppet head, ore bins, chimney and shed. Residences adjacent to mine and streets. Poppet heads visible in far background. surface equipment, surface site, bendigo, mines and mining, mine, mining, poppet head, transport, dray, mining landscape, landscape -
Bendigo Historical Society Inc.
Photograph - NORTH DEBORAH GOLD MINE
... Square. Concrete ore bins and section of iron chimney.... Concrete ore bins and section of iron chimney in foreground. Steel ...North Deborah Gold Mine, south of Breen Street, Golden Square. Concrete ore bins and section of iron chimney in foreground. Steel poppet leg visible on extreme LH side.Kay MacGregorbendigo, mining, north deborah gold mining company -
Stawell Historical Society Inc
Photograph, Sloane's & Scotchman United Quartz Mining Co Looking East up upper Main Street c1916
... Street The back view of the Ore Bin can be seen. ... Street The back view of the Ore Bin can be seen. stawell mining ...Sloane's & Scotchman Mining Co Looking East up upper Main Street The back view of the Ore Bin can be seen. Street view looking uphill towards mine site. Cows grazing at right.stawell mining -
Bendigo Historical Society Inc.
Photograph - NEW ARGUS MINE - PHOTOGRAPH (COPY)
... , then the poppet legs, ore bins and more buildings. In front of the poppet... on it. In the centre is the chimney, then the poppet legs, ore bins and more ...Black and white photocopy of a photograph of the New Argus Mine. Photo shows the buildings on the left with a horizontal tank with the name on it. In the centre is the chimney, then the poppet legs, ore bins and more buildings. In front of the poppet legs is a group of miners.photo, new argus mine, mining, bendigo -
Bendigo Historical Society Inc.
Photograph - KEN BICE COLLECTION: HUSTLERS ROYAL RESERVE MINE, BENDIGO. 1905
... standing around a rock drill, one man in foreground pushing an ore... standing around a rock drill, one man in foreground pushing an ore ...Copy of photo: on back of image face of drive, Hustler's Royal Reserve Mine, Bendigo, C 1905?' Image shows four men standing around a rock drill, one man in foreground pushing an ore bin. This is a digital only photograph.bendigo, mining, hustler's royal reserve mine, bendigo, hustlers royal reserve mine -
Bendigo Historical Society Inc.
Document - Digital, KEN BICE COLLECTION: SPECIMEN HILL UNITED MINE
... in foreground. Two ore bins in front of poppet head.... on RH and LH side in foreground. Two ore bins in front of poppet ...Copy of photo: (also copy) Specimen Hill United Mine, image shows poppet head in centre of image, written on side 'Specimen Hill UCMS' Piles of mullock on RH and LH side in foreground. Two ore bins in front of poppet head.bendigo, mining, specimen hill united mine, bendigo, mining, specimen hill united mine, poppet head. -
Bendigo Historical Society Inc.
Photograph - DEBORAH GOLD MINE, GOLDEN SQUARE
... ore bins on RH side. Large mullock hills at RH rear of ore...) with tramway and poppet head at rear. Two ore bins on RH side. Large ...Black and white photograph of Deborah Gold Mine, Abel Street, Golden Square. Image shows large mining sheds (engine house, boiler room) with tramway and poppet head at rear. Two ore bins on RH side. Large mullock hills at RH rear of ore bins. Written on back of photo 'Deborah Reef Gold Mines NL 20.3.37' Paper with photo states:' The Deborah Gold Mine, Abel Street. The poppet head was moved from the Windmill Hill mine Long Gully. This photograph was taken in March 1937 after a further 10 heads had been added to the battery'bendigo, mining, deborah gold mines -
Bendigo Historical Society Inc.
Slide - ALBERT RICHARDSON COLLECTION: NEW MOON GOLD MINE, EAGLEHAWK
... chimney and mine buildings on RH side, ore bins and mine sheds... in centre of image, brick chimney and mine buildings on RH side, ore ...Slide. .New Moon Gold Mine, Eaglehawk. Mine situated west of Beebzlebub Road, Eaglehawk. Poppet head in centre of image, brick chimney and mine buildings on RH side, ore bins and mine sheds on LH side. Image sourced from 'Healthy, Golden Bendigo' book.No. 25 printed on bottom of slidemine, gold, new moon., bendigo mines-jack hattam collection -
Stawell Historical Society Inc
Photograph, Magdala cum Moonlight Mine Poppet Head 1899
... of the first ore bin, a man can be seen opening the door of the bin... of the first ore bin, a man can be seen opening the door of the bin ...Magdala cum Moonlight Mine Poppet Head 1899 Darling Road can be seen passing under the trestle tramway. Just in front of the first ore bin, a man can be seen opening the door of the bin to fill a dray for the crushing battery.Poppet Head and surrounding infrastructure.stawell gold mining -
Bendigo Historical Society Inc.
Photograph - Nell Gwynne Mine Site, 1934
... with poppet head in foreground. An ore bin is on the ground in far... in centre of image with poppet head in foreground. An ore bin ...Significant to mining history of Bendigo.Black and white photograph of Nell Gwynne mine site. Shed under construction on left hand side of image with small shed immediately in front of the large shed. Two sheds in centre of image with poppet head in foreground. An ore bin is on the ground in far left of image. Soft top 'Tourer' car in foreground. Written in pencil on back of photograph in black pen: 'Nell Gwynne '5/12/34'nell gwynne gold mine, shaft -
Bendigo Historical Society Inc.
Document - MCCOLL, RANKIN AND STANISTREET COLLECTION: CENTRAL DEBORAH GOLD MINE NL: GUIDE TO MINE, 1985
... and shaft, change room, drying room, first aid room, ore bins... room, ore bins, boiler, stoke hold, winding engine, boiler feed ...Document: 2 copies of complimentary guide to the Central Deborah Gold Mine. Details information about poppet legs and shaft, change room, drying room, first aid room, ore bins, boiler, stoke hold, winding engine, boiler feed pump, electric compressor, dteam driven compressor and blacksmith's shop.Central Deborah Gold Mine NLorganization, business, central deborah gold mine, mccoll, rankin & stanistreet collection: central deborah gold mine nl, goldmining -
Bendigo Historical Society Inc.
Photograph - NORTH DEBORAH GOLD MINE GOLDEN SQUARE
... , engine house, chimney stack. Two ore bins to the right of poppet... house, chimney stack. Two ore bins to the right of poppet head ...Black and white photograph of North Deborah Gold Mine, 1940's. View of entire site showing poppet head, trestleway, engine house, chimney stack. Two ore bins to the right of poppet head. 1920's vehicle on far right of photo. Country style outhgouse in foreground of photo. Chimney stack on RH side. -
Bendigo Historical Society Inc.
Photograph - NORTH DEBORAH GOLD MINE POPPET HEAD
... on top with ore bins on right hand side. Not visible on top.... Image shows a steel poppet head, winding wheels on top with ore ...North Deborah Gold Mine steel poppet head, Breen Street, Golden Square. Image shows a steel poppet head, winding wheels on top with ore bins on right hand side. Not visible on top of poppet head are two air raid siren horns, installed during World War 2. Fig tree growing near shaft.Kay MacGregor 2012bendigo, mining, north deborah gold mine -
Stawell Historical Society Inc
Photograph, Sloane's & Scotchman United Mining Co in Stawell looking North West with Poppet Heads & Sheds 1914 -- Photo & Colured Painting
... Poppet Heads, Ore bin Winding Engine Shed Sloane's... grampians Poppet Heads, Ore bin Winding Engine Shed Sloane's ...Poppet Heads, Ore bin Winding Engine Shed Sloane's & Scotchmans United Quartz Mining Co looking North West Moonlight dams in background. Mine on left is the old Extended mine where the winding engine shed has been destroyed by fire. Just behind that is the Winding Engine Shed of the Oriental Mine without the poppet head.View of two mine sites with poppet heads and engine sheds. Settling dams in background.mining, panorama -
Bendigo Historical Society Inc.
Photograph - WES HARRY COLLECTION: LANDSCAPE VIEW OF MINING
... . Whims in centre. Horse and carts . Two men tipping an ore bin... and carts . Two men tipping an ore bin on right hand side near ...Black and white photo copy: image shows mining landscape, large chimney in front right hand side, slab timber buildings on individual shaft sites, mining cottages, very sparse landscape. Whims in centre. Horse and carts . Two men tipping an ore bin on right hand side near chimney. Landscape could be looking to either New Chum Hill or Hustler's Hill, Bendigo.Batchelderplace, bendigo, mining landscape, bendigo, sandhurst, goldmining, gold, new chum hill, hustlers hill -
Bendigo Historical Society Inc.
Photograph - UNKNOWN MINING PHOTOS - POPPET LEGS & BUILDINGS
... the building, ore bins with a man and horse and dray beside them... the building, ore bins with a man and horse and dray beside them ...Black & white photocopy of a photo of the poppet legs, a corrugated iron building, a wood stack, and a frame structure. A man is on the walkway going toward the landing brace. (b) Picture of woden poppet legs, corrugated iron building, tramway and a large mullock heap. (c) Photocopy of wooden poppet legs with stairway going up to the landing, corrugated building, a tank beside the building, ore bins with a man and horse and dray beside them. In the background are houses.photo, unknown mining photos, poppet legs & buildings -
Bendigo Historical Society Inc.
Document - JOAN O'SHEA COLLECTION: CENTRAL DEBORAH GOLD MINE BENDIGO, 26th November, 1984
... , ore bins and loading bays, stamper battery, wilfley table..., ore bins and loading bays, stamper battery, wilfley table ...Joan O'Shea Collection. Central Deborah Gold Mine Bendigo. Promotional material. Chronological History, Poppet legs and shaft, Change Room, Caretakers or rag pickers room, Drying room, first aid room, carbide light room, Underground, carpenters shed, ore bins and loading bays, stamper battery, wilfley table, berdan pans, laboratory, display room, boiler, stroke hold, winding engine, boiler feed pump, electric driven compressor, steam driven compressor, blacksmith's shop.Photograph Courtesy Philip Beer.mining, marketing, central deborah mine. -
Bendigo Historical Society Inc.
Document - ALBERT RICHARDSON COLLECTION: HERCULES AND ENERGETIC
... of tramway, height of poppet head, position of ore bins and other..., height of poppet head, position of ore bins and other buildings ...a. Five page handwritten document titled 'Mine Manager John Truscott's Report Hercules and Energetic' Other reports included from Mine Managers on the Hercules and Energetic Mines are: J. Woolcock's report 4.3.1895, F. Youlden 1898 and J. Roberts 1911. b. One page hand drawn plan of titled ' Hercules transverse plotted by A.E. R., .D., A.A., page 23, 24.3.37. Hercules Long, by A.E.K. , W.R.N 24.3.37. Plans show measurements of tramway, height of poppet head, position of ore bins and other buildings on mine site.Albert Richardsonbendigo, mining, hercules and energetic mine -
Bendigo Historical Society Inc.
Document - MCCOLL, RANKIN AND STANISTREET COLLECTION: INDENTURE, GOLD MINING LEASE CROWN AND RONALD ALEXANDER RANKIN, BENDIGO, 24th June 1941
... shows lease 11166 marked in yellow with shaft, ore bins... shows lease 11166 marked in yellow with shaft, ore bins ...6 page document, Gold Mining Lease 11166, plus map. Indenture between Crown (King George VI) and Ronald Alexander Rankin of Bendigo, dated 24th June, 1941. Map No. 11166 Bendigo, Mining District of Bendigo, Parish of Sandhurst, County of Bendigo. Map shows lease 11166 marked in yellow with shaft, ore bins and tramway marked. Belle Vue Road , Adam Street and Griston Street shown on map. ( Golden Gully area) Dams indicated on lease holdings. Other lease holdings: 1675 T.L.9858, 10990, 11013, 11062, 11165, 11063 (void) 1172 W.R. (dam thereon) 9882 (void). Some residential lots marked along Belle Vue Road, and Adam Street. On bottom of map 21.8.41 in pencil. On last page of document : North Deborah Mining Company now the proprietor of the within described estate by transfer registered on 11th November 1914.bendigo, mining, north deborah lease, belle vue road, adams street, griston street, golden gully, ronald alexander rankin, north deborah mine. -
Bendigo Historical Society Inc.
Book - JOAN O'SHEA COLLECTION: CENTRAL DEBORAH UNDERGOUND PROJECT, 20th June, 1986
... , underground tours, carpenters shed, ore bins and loading bays, stamper... light room, underground tours, carpenters shed, ore bins ...Joan O'Shea Collection. Central Deborah Gold Mine Bendigo Violet Street (off High Street) Bendigo Pamphlet. Buff and Sepia double-sided A4. The Bendigo Trust in conjunction with the City Family Hotel present the opening of the Central Deborah Gold Mine Underground Project, by Premier John Cain, 20th June, 1986 featuring the City Club Dancers. Includes a brief chronological history of the mine and photographs courtesy of Phillip Beer on recto side. The verso side contains a map of the site of the Central Deborah Gold Mine and also various photographs with further detail of areas of interest including: poppet legs and shaft, the change rooms, caretakers or rag pickers room where clothing was searched, the drying room, the first aid room, carbide light room, underground tours, carpenters shed, ore bins and loading bays, stamper battery, wilfley table, berdan plans, laboratory, display room, boiler, stoke hold, winding engine, boiler feed pump, electric driven compressor, steam driven compressor and the blacksmith's shop.Central Deborah Gold Mine Bendigobendigo, gold mining, central deborah gold mine -
Bendigo Historical Society Inc.
Photograph - MINING IN BENDIGO COLLECTION: MINING PHOTOGRAPHS
... the mine and its buildings, chimney, ore bins, mullock heap..., Sandhurst Road. It shows the mine and its buildings, chimney, ore ...BHS CollectionFolded paper with copies of photos of mines and various mining buildings. On the front is a view from New Chum Hill, looking south in 1890's. Pictured is the Lazarus Crushing Plant and boiler house, Lansell's '222'. Amd the new Chum Mines in the background. On the inside at the top is the New Chum Railway, Golden Square. Pictured is the mine and its buildings, two chimneys, two large wood stacks and other mines in the background. On the left, a man is standing on the side of the railway line beside the mine. The next picture is the United Hustlers and Redan Mine, west of Comet Hill State School, Sandhurst Road. It shows the mine and its buildings, chimney, ore bins, mullock heap and tramway. The middle picture is the Central Deborah, Violet Street, near Bendigo Creek, Golden Square. It shows the poppet legs, buildings and some machinery behind the large building. The large building has eight ventilators in the roof. The buildings are made of corrugated iron. The bottom left picture is the Deborah Mine, Quarry Hill. The picture shows the poppet legs on the hilltop, the buildings beside it, a square chimney behind the poppet legs and some vegetation and a peppercorn tree in the foreground. The far building also has ventilators in the roof. The picture on the right is underground at 1000 feet level in the Deborah Mine. Pictured are three men with a rock drill. On the back, at the top is a picture of a First Motion Winding Engine at Deborah - later at Central Deborah. The picture shows the engine and driver. The middle picture is the South New Moon Mine, Eaglehawk - leading mine in State in 1903. The picture shows the poppet legs, buildings, chimney and a high tramway. In the foreground is a dam. The bottom picture is Victoria Hill looking south to New Chum Hill. In the foreground is Lansell's '180' Mine and Ballerstedt's Open Cut and in the background are the 'New Chum and Victoria', 'Old Chum' and the 'North Old Chum'.photo, mining in bendigo, mining photographs, lazarus crushing plant, lansell's 222, new chum mines, new chum railway, united hustlers and redan mine, comet hill state school, central deborah, deborah mine, first motion winding engine, south new moon mine, lansell's 180, ballerstedt's open cut, new chum and victoria, old chum, north old chum, square chimney -
Bendigo Historical Society Inc.
Leisure object - WOODEN MODEL CYANIDE PLANT
Wooden model of a cyanide plant. A cyanide plant was used for dissolving gold from finely divided ores by means of dilute solutions of sodium or potassium cyanides. The model has five metal bins, there is some rust on the bins and scorch mark on the wooden base.mining, equipment, cyanide plant, gold cyanidation (also known as the cyanide process or the macarthur-forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. it is the most commonly used leaching process for gold extraction. the ore is comminuted using grinding machinery. depending on the ore, it is sometimes further concentrated by froth flotation or by centrifugal (gravity) concentration. water is added to produce a slurry or pulp. the basic ore slurry can be combined with a solution of sodium cyanide or potassium cyanide, however many operations utilize calcium cyanide, which is more cost effective. to prevent the creation of toxic hydrogen cyanide during processing, slaked lime (calcium hydroxide) or soda (sodium hydroxide) is added to the extracting solution to ensure that the acidity during cyanidation is maintained over ph 10.5 - strongly basic. lead nitrate can improve gold leaching speed and quantity recovered, particularly in processing partially oxidized ores.