Gold Mining Africa

      Africa is a major producer of gold in the world, producing up to 30% of global production in gold mining africa. Africa has historically been recognized for its exceptional gold resource potential yet remains relatively under-explored. The opportunity to acquire prospective gold resource projects in Africa, and assure security of tenure, is often lost through failure to recognize and acknowledge the interests of local stakeholders.Although gold mining industry in South Africa is one of the global leaders in gold production, it also has the highest average production costs in the world. Coupled with labour problems, lowering grades as well as several mines reaching the end of their lives, it is not anticipated that South African production will increase in the future. Although Zimbabwe has historically been a prominent gold producer in Africa, political and economic issues could cause production problems for local producers. Tanzania and Mali are rapidly becoming Africa's newest gold producers with several mines being commissioned or in final feasibility stages. Ghana is still a major gold producer in Africa. Other countries contribute steadily to Africa's gold output. Much of the recent and ongoing success in tapping these areas' mineable gold reserves is simply due to the fact that low-grade (to 1.3 grams / tonne gold) near-surface (oxidised) ores can be recovered economically. A new challenge will be to economically recover low-grade sulphide ore by open pit and/or underground methods.

Martha Gold Mine Unique Open Pit Mining By Newmont

Martha gold mine constitute open pit mine that is very unique, located in the township of Waihi, New Zealand

Martha mines constitute open pit mine that is very unique, because the mining area is located in a residential area and near to a thriving community. With a population of about 4,700 people, the town of Waihi is situated on the east coast of the North Island of New Zealand.  Martha gold mine is  located in the township of Waihi, New Zealand. and owned by the Newmont Mining Corporation  a leading gold producer in the world.

Gold mining in Waihi has a history that spans three centuries. Gold was discovered in the 1800s and mined underground in the first half of the 1900s. The last 24 years of the 1900s focused on exploration

The Martha Mine has been operating since 1988. Martha gold mining project  was the first major hard rock mining operation to be commissioned following the resurgence of the gold mining industry in New Zealand in the late 1970s. The mining licence was granted for the open pit Martha Mine in 1987 and development and mining of the Martha Mine open pit. In the 2000s

Mineral Ore deposit in Martha gold mine New Zealand

The climate of Waihi is affected by its local topography. The rainfall in Waihi is relatively high, averaging in excess of 2,100 mm/year. Geology in waihi comprises predominantly rhyolite, with some dacite. The Waihi gold deposits are low sulphide epithermal gold-silver veins with associated volcanic breccias. The gold veins are hosted within a fine-grained volcanic rock, andesite, aged between 3 and 12 million years ago (Ma), during the Pliocene and Miocene.



MINING PROCESS IN MARTHA GOLD MINE NEW ZEALAND

Process Of Gold Mining In Super Pit Mine Australia

Super pit gold mine is the largest open pit mine

Kalgoorlie mine In Australia or better known as the Super Pit is located off the Goldfields Highway on the south-east edge of Kalgoorlie, Western Australia. Super pit gold mine is the largest open pit mine which has a hole a length of about 3.5 kilometers, 1.5 kilometres wide and 570 metres deep that make up the rectangle.

The Super Pit gold mine is owned by Kalgoorlie Consolidated Gold Mines Pty Ltd, a company owned two joint venture between Barrick Gold Corporation and Newmont Mining Corporation with respective shares of 50%

Kalgoorlie Consolidated Gold Mines Pty Ltd (KCGM) was formed to manage the assets and operations of joint venture partners, Normandy Australia and Homestake Gold of Australia Limited.

MINERAL DEPOSIT IN SUPER PIT GOLD MINE

Mineral deposit in super pit gold mine

Gold deposits Super Pit is one of the richest gold deposits in the world.  Composed of a series of mineralised faults known as lodes, a greenstone belt consisting of volcanic and sedimentary rocks and surrounded by extensive granite. These rocks all belong to the Archaean period of the Earth’s history and the goldfield is between 2.6 and 2.9 billion years old.  the deposit mainly occurs in a host rock known as the Golden Mile Dolerite.

The main host rock for mineralisation the Kalgoorlie district in Super Pit gold mine is the Golden Mile Dolerite, the largest of the dolerites in the area. There are two main styles of mineralisation. The Fimiston Style consists of classic Golden Mile lodes with abundant sulphides and tellurides. The Charlotte Style describes younger white quartz veins which are typically mined at Mt Charlotte, but have been found in other smaller deposits in the Kalgoorlie District.

The Golden Mile lodes have several characteristic orientations, each with slight variations in the style of the mineralisation. More than 1,000 individual ore lodes occur within the Golden Mile, some extending up to 1,800 metres long, 1,200 metres deep and 10 metres wide. They are all within an area over five kilometres long, two kilometres wide and more than one kilometre deep. The highest gold grades are typically associated with gold tellurides and alteration minerals with high vanadium contents.

PROCESS OF MINING IN SUPER PIT GOLD MINE AUSTRALIA

Process Of Mining In Batu Hijau Mine Indonesia

Batu Hijau mine Southwest region of the island of Sumbawa, in the District of Sekongkang, West Nusa Tenggara Province in Indonesia

Batu Hijau mine is process of mining with a large surface mining operation in Indonesia,  the located in the southwest region of the island of Sumbawa, in the District of Sekongkang, West Nusa Tenggara Province in Indonesia.  Batu hijau mine Indonesia originally discovered in 1990 and then commercial mining production began in 2000, primarily producing copper and small amounts of gold and silver.

Mining Project in Batu Hijau mine held by PT Newmont Nusa Tenggara (PTNNT), a company owned by Newmont Indonesia (US, 35.44%); Nusa Tenggara Mining Corporation (Japan, 27.56%), PT Pukuafu Indah (Indonesia, 20%) and PT Multi Daerah Bersaing (Indonesia, 17%) with system  contract of work and Newmont as the project operator.

MINERAL DEPOSIT IN BATU HIJAU MINE INDONESIA

Ore mineral in Batu hijau mine Indonesia

Mineral deposits in the mines Batu hijau is a porphyry copper deposit containing small amounts of gold and silver ore

These Porphyry copper deposit are overwhelmingly hosted by composite stocks of diorite to quartz-diorite and, to a much lesser degree, more felsic compositions such as tonalite and monzogranite.

Mineral deposits tend to be characterised by a strong correlation between the distribution of copper sulphides (chalcopyrite and bornite) and gold as the native metal in addition to having a notably higher magnetite content. Gold typically occurs as minute (<10-15 micron) inclusions in the copper sulphides.

Porphyry copper deposit is indeed very typical deposit found in the Southeast Asian region. These porphyry deposit is one in which the valuable metals are not immediately available and require processing since they are mixed with rocks and minerals that are not economical to process.

Ahafo Mine In Ghana Mining Operations And Mining Methods

Ahafo gold mine in Ghana is owned Newmont Mining, one of the world’s largest gold mining company. The Ahafo mine is located in the Brong Ahafo region of west-central Ghana west africa, about 30 km south of Sunyani and 307 km northwest of the capital city of Accra. Gold mine production in Ahafo started 2006 and in 2010, produced 545,000 oz of gold at a cost of $450/oz.  Ahafo has two primary ore zones: Ahafo South and Ahafo North. Mining is currently underway at Ahafo South.

Ahafo gold mine’s property covers three segments of the granodiorite - metasediment contact. Gold mineralisation is generally associated with a brecciated and hydrothermally altered shear-zone of granodiorite lying in thrust/wrench contact with underlying graphitic phyllites of the Birimian Supergroup. The phyllities also contain scattered pods of gold mineralisation, but these appear to be limited to a zone lying no more than 20 m from the granodiorite. The thrust contact always dips east at angles varying from 30° to 65°. Gold mineralisation is also associated with a shear zone about 1.2 km east of the granodiorite - metasediment contact that was expressed by a low-level soil geochemical target. The granodiorite hosted shear zone is subparallel to the main trend and dipping from 60° east to sub-vertical.

Mining Operations And Mining Methods  In Ahafo Mine In Ghana