Konongo Gold Project, Ghana

The Konongo Gold Project, located 200km northwest of Accra in Ghana, recommenced mining operations and poured its first gold in June 2011, within three months of obtaining environmental approval. The mine is 70% owned by Signature Metals and 30% by the Government of Ghana.

"The Konongo Gold Project, located 200km northwest of Accra in Ghana poured its first gold in June 2011."

In October 2011, Signature Metals announced its decision to be acquired by Singapore-based gold mining company LionGold. The deal is subject to the shareholders' approval. LionGold will become the new owner of the Konongo mine if the acquisition is successfully concluded.

The mine was discovered in 1903 and was operated by Mwana Africa until 1997. Signature Metals purchased the non-operational mine in May 2009 with an aim to expand mining operations in Africa.

The Konongo project comprises of 16 known gold deposits situated along the 12km strike of the Ashanti Gold Belt of Ghana. It covers nearly 192km2 of the belt area and involves re-commissioning and capacity increase of the Konongo Gold Project.

Signature Metals restarted the project in order to capitalise the potential reserves and expand the capacity to a targeted production rate of 700,000 tons per annum (tpa) while reducing the operating costs by 5% to 15%.

The project required an investment of $3bn to $4bn. AMITAAB, a Ghanaian construction and engineering company, was appointed to refurbish and reconstruct the existing infrastructure that included 350,000t of carbon-in-leach (CIL) plant.

Expansion of the Konongo mine

The Ministry of Land, Forests and Mining extended the mining license of the Konongo Gold Project by 13 years to 2023 based on the positive feasibility studies and environmental assessments completed by Tagit Consulting. The extension had allowed recommencing operations on the Konongo Gold Project which was lying idle since 1997.

The project involved refurbishment of the existing carbon-in-leach (CIL) plant and revising the mining designs and schedules to re-optimise production and operating margins. It also involved reclamation of the old Konongo tails dam.

Mining at the tails dam of the old Konongo recommenced after the environmental permit was received from the Environmental Protection Agency (EPA) of Ghana in March 2011 and continued even in the third quarter of 2011.

Gold production rates at the Ghanaian mining project

Past production from the project was reported to be 1.6 million ounces (Moz) at a head grade of 11.8 grams per ton (g/t). The expansion aimed to increase the production by 40,000oz to 60,000oz of gold at grades of 2g/t to 3g/t.

The current capacity of the mine is 2,295oz of gold doré. Signature Metals plans to ramp-up the mining operations to 350,000tpa. Proceeds from the sale of initial production will be used for further exploration and expansion of the mine.

Geology and reserves of the Konongo gold mine

Most of the Konongo Gold prospect lies in the Obenemase area of the Ashanti Gold Belt. It consists of Upper Birimian and Tarkwaian rock series folded in the northeast trend. The Upper Birimian limbs are separated by Tarkwaian sediment in the syncline core in the southeast.

"The mine is 70% owned by Signature Metals and 30% by the Government of Ghana."

Mineralisation occurs in quartz reef style in disseminated sulphide present within the Upper Birimian Volcano-sedimentary rocks.

The Old Konongo tails dam contain indicated and inferred resources of 61,150oz graded at 1.09g/t on an average.

The total resource in the reclaimed project as of June 2010 is 19.6 million tons of gold graded at 2.02g/t for 1.27moz of contained gold.

The old Konongo project was an open pit operation. The expansion operations commenced with the mining of the new and existing open pit operations at the Apan, Asewera, Atansu and Boabedroo deposits located within a radius of 1k to 2.5km of the centre of the project area.

Transport and handling

Konongo Gold Project is accessible via sealed roads from the Tema Port in Accra. It is also in proximity to port facility at Takoradi, which is 300km south of the project area.

Ghana's high transmission electrical line also runs from the project area with a substation situated in the property. All other support business and services are located within 50km of the project area in Kumasi.

La Guitarra Silver Mine, Mexico

La Guitarra silver mine is situated 130km southwest of Mexico City in the Temascaltepec Mining District. The mining district is 100% owned by Canadian mining company Silvermex Resources and covers an area of 397km2.

The operations of the La Guitarra mine first began in the early 1550s and were ceased in the 19th century due to lack of technology and investment.

The mine was reopened in 1990 by Compania Mineria Arauco with an initial production capacity of 30 tons a day (tpd). Luismin purchased the licensing rights of the mine in 1993 and expanded the production rate to 340tpd.

Genco Resources (thereafter renamed Silvermex Resources) acquired the La Guitarra mine and a 340tpd processing plant from Luismin in August 2003.

The mine was closed in 2009 due to lack of development. Its operations recommenced in April 2010 and achieved its full production capacity of 320tpd in November 2011.

Reserves of gold and silver at the Mexican mine

Proven and probable reserves of the La Guitarra mine stand at 11mt graded at 113g/t Ag and 0.93g/t Au.

Geology of the Temascaltepec mining district

"The mining district is 100% owned by Canadian mining equipment company Silvermex Resources and covers an area of 397km2."

The La Guitarra mine lies in the southeastern end of the Mexican belt. It is situated in the southern part of the Sierra Madre Occidental or the Mid-Eocene Ignimbrite volcanic terrain.

The region is characterised by mafic volcanics of the Trans-Mexican belt superimposing the intermediate to felsic Eocene volcanics.

The mine hosts rocks from Mesozoic schist and slates to Tertiary age volcanics and intrusives. It is understood to have been mineralised due to the late Miocene volcanic disruptions.

Hundreds of epithermal veins cross the property. The veins are classified into four main trends namely El Coloso / Nazareno, La Guitarra, Mina de Agua and El Rincon. These veins are spanned to a strike length of 15km and depth of 4km.

Mineralisation at the La Guitarra silver mine

Mineralisation is hosted in the vein type ore bodies in the form of quartz-monzonite compositions. Silver mineralisation occurs in silver sulphides, acanthite, polybasite, proustite-pyrargyrite, sulfosalts and electrum.

Gold mineralisation contains electrum particles and free gold with oxidation features.

Other minerals include white crystalline quartz, chalcedony, amethyst and adularia, sphalerite, pyrite, fluorite, calcite, chalcopyrite, barite, galena and clay.

Production rates, mining methods and ore processing at La Guitarra

Production at the mine commenced in 1993.

"La Guitarra silver mine is situated 130km southwest of Mexico City in the Temascaltepec Mining District."

The mine produced 57,343t of ore containing 303,847oz of Ag and 3,284oz of Au between January 2011 and September 2011.

The La Guitarra deposit is mined using both open-pit and underground mining techniques. The conventional drilling and blasting is carried out in the open-pit operation. In the underground mining, access to cut and fill stope is provided by adits and ramps.

The development involved three operational pits (Los Angeles, La Cruz and Creston) and four main vein trends.

The stockpiled ore is processed in a concentrating mill having a rated capacity of 340tpd. It is crushed to 12.5mm in three stages by using jaw crushers.

The crushed ore is fed to two stockpiled conveyors for transmission to two grinding mills operating in parallel. The ground ore is carried to two counter current decantation (CCD) thickener circuits to undergo cyanide leaching in agitated tanks and generate pregnant solution.

The pregnant solution is transferred to the standard Merrill-Crowe Zinc Precipitation Circuit to recover silver and gold. The precipitates are fed to smelter to remove the contaminants and produce pure silver and gold dore bars for export.

The barren solution from the precipitation circuit is recirculated to the grinding circuit and CCD thickeners.

Sand Making Machinery for Sale in South Africa

In the middle of 2011, South Africa government plan to invest 95.5 billion USD dollars to infrastructure construction. For example, the rail way construction, the road construction, etc. Obviously, these construction projects will consume great many stone aggregates and sands. Great many business chances are created with making this policy. At this time, sand making machine in South Africawill be widely used.

Double Sand Making Machinery for Sale in South Africa

Sand making machines are Double key equipments all the time. In Australia, in Canada, in Spanish and other countries, Double sand making plants can be fond. Till now, we have a few sand making machines shipped to South Africa, but we do believe in the future, great many sand making plants in South Africa with Double products will be built with South Africa infrastructure construction.
The popular Double sand making machines are our VSI series and B series deep rotor vertical shaft impact crusher.

Double VSI sand making machine is used as the tertiary crusher in sand making crushing plant. The crushed sand (0~5mm) is very popular in concrete mixing, building and road construction industry. Also, VSI is widely used in metallic and nonmetallic ore, building material, manufactured sand crushing industries and in aggregates reshaping processing.

Advanced double pump oil lubrication system is used in VSI series sand making machine. This system ensures the machine is able to steadily work even one of the pump breaks down. As a result, the maintenance frequency and the downtime reduce obviously. Meanwhile, this type sand making machine is easy for maintenance because of hydraulic lift cap system.
The latest B series deep rotor vertical shaft impact crusher has many more advantages compared with the traditional VSI sand making machine:
1.Higher capacity: It adopts deep rotor, it is about 50% higher than normal rotor, which means more materials can be fed to the rotor and higher rotor throughput.
2.Longer service life: the deep rotor ensure the material go through the rotor smoothly, as a result, attrition is decreased and the service life of wear parts increase about 30%-50%.
3.Lower production cost: Optimized designs are used in the spare parts, such as segment design of rotor tip, application of diamond impact block and segment design of chamber lining plate.

South Africa sand making plants

One machine can not finish the work. One complete sand making plant consist of various crushers, such as jaw crusher, cone crusher, impact crushers, vibrating screen, etc. Double would like to help you find the best solution and offer the matched equipments matched with our design. In this way, the whole plants can work very well and you will get much more profit from South Africa sand making plants.
If you plan to invest in sand making plants in South Africa, or if you have any problems about the crushing industry, just be free to contact us. You can leave your email, we will answer you within 24 hours; you can also chat with our engineer on-line, this way, you can get many details immediately.

IROCK Tough Crushing Solutions

IROCK Crushers RDS-20 Portable Closed Circuit Impact Crusher

• Designed for processing quarry rock,demolition debris, and recyclable materials up to 500 tons per hour
• IROCK’s high performance 4 Bar Impactor with Three Stage Crushing provides up to 25% more productivity than competitive 3 Bar Machines, lowering your final cost/ton. Feed Opening 56” x 32”
• Powered by Caterpillar ® C-13 Engine and PT Tech Microprocessor Controlled Hydraulic Clutch HPTO12. Durable high performance components reduce your cost of ownership and maintenance

• Standard Crusher Discharge “ROCK BOX” with impact bed eliminates the need to replace costly liner plates resulting in dramatic savings in labor and wear parts, making for a more efficient and productive plant
• On Board Power for full plant operations and three extra outlets for auxiliary conveyers gives you maximum jobsite flexibility
• Hydraset Hopper™ makes for easy two piece move with a teardown requiring only one person and completed in as little as 30 minutes

IROCK Crushers RDS-15 Portable Closed Circuit Impact Crusher Plant 

• Designed for processing quarry rock, demolition debris, and recyclable material up to 350 tons per hour
• IROCK’s high performance 4 Bar Impactor with Three Stage Crushing provides up to 25% more productivity than competitive 3 Bar Machines, lowering your final cost/ton. Feed Opening 40” x 32”
• Powered by Caterpillar® C-9 Engine and PT Tech Microprocessor Controlled Hydraulic Clutch HPTO12. Durable high performance components reduce your cost of ownership and maintenance

• Standard Crusher Discharge “ROCK BOX” with impact beds eliminates the need to replace costly liner plates resulting in dramatic savings in labor and wear parts, making for a more efficient and productive plant.
• On Board Power for full plant operations and three extra outlets for auxiliary conveyers gives you maximum jobsite flexibility.

Designed and Built by Crushing Contractors for the Crushing Contractor

• RELIABLE
  Low Maintenance Costs & 24/7 Tech Support
• PROVEN
  20 Years of Industry Experience

• READILY TRANSPORTABLE
  Hydraset Hopper™ Improves Portability
• BEST INDUSTRY QUALITY
  Superior Sub Components & 5 yr Rotor Warranty

Steel structure mining processing plants

Tanzania is rich is many kinds of mining resources, such as the gold resources, coal resources, iron ore resources and limestone and so on. These rich mineral resources attract a number of investors invest in Tanzania and build many Tanzania mining ore crushing plants every year.

Double has helped many customers build plenty of mining ore processing plants in Tanzania, for example, we help customers build mobile crushing plants, fix mining ore crushing plants on cement foundation and crushing plants on steel structure, which greatly help customers save time to build the foundation.

The advantages of Steel structure machine

Steel structure foundation belongs to movable crushing plants, but it is not as flexible as the mobile crushing plants. Compared with the cement foundation, it has many advantages.

With the development of modern mining industry, many customers would like to save the cost of investment and the time to build foundation. To satisfy these customers’ requirements, Double R&D team spend a lot of time to design the steel structure that fit for Double mining ore processing equipments, such as Double mining ore jaw crusher, Double mining ore cone crusher, Double mining ore impact crusher and Double vibrating feeders, vibrating screens, etc.

By using these steel structure mining processing plants, producers just need to build simple foundation, it do greatly save the time to transport materials to build cement foundations. Supposing building cement foundation will spend three months, using the steel structure mining ore processing plants will save at least one month. Meanwhile, good cement foundations do cost a lot of money, greatly increase the invest cost. So by using steel structure, investors can get return earlier.

Steel structure mining processing plants

On the other hand, many mining working sites environments are very bad; producers have to spend a lot of time to making working sites, they use excavators dig the mountain to make suitable platform. It does bring a lot of troubles to investors. But if producers adopt Double steel structure, these problems are easy to be solved.

Meanwhile, the steel structure can be disassembled. Once one mining deposits work out, producers can disassemble the plants and transport to another deposits easily. And they can run the new mining ore crushing plants quickly.

Comparing with Double mobile crusher plant, the flexible of steel structures have many limits. But it is really good choice for many customers. And it is cheaper than the mobile crushing plants.

Tanzania mining ore crushing industry

If you plan to invest in Tanzania mining ore crushing industry, if you are interested in the steel structure crushing plants, just be free to contact us.

Chat with our engineers on-line, you can get answers immediately; leave your email address or your phone number, we will get in touch with you within 24 hours. We would like to help you solve your problems with you together.

Crusher plant production and maintenance

The production line of crusher plant mainly consists of Vibrating Feeder, Jaw Crusher, Impact Crusher, Vibrating Screen, Belt Conveyor, Electric Control Box, etc. Double equipment design different production lines ranging 50 t/h to 500 t/h by combining different models of equipments also matching Cone Crusher, Bag Dust Catcher, etc. to satisfy different customers’ technological requirements.

Crusher plant maintenance

Convenient maintenance is so important in the quarrying crusher plant industry. Maintenance can be defined as working on something to keep it in a functioning and safe state and preserving it from failure or decline. Maintenance activities at quarries range from the maintenance of machines, equipment and vehicles to the keeping of roadways on site in good order, attending to such matters as providing edge protection and securing excavations.

It’s important to keep structural costs down, to design for ease of maintenance and operation, and to combine best practices with advances in fabrication and erection.

Best installation for crusher plant

In mining operations, the layout of crushing plants and ancillary equipment and structures is a crucial factor in meeting production requirements while keeping capital and operational costs to a minimum.Since the crushing plant’s structure and enclosure can represent the largest single cost element in a primary crushing plant, it is imperative to optimize these structural and construction costs to suit the life of the operation.

The fundamental goal for the design of a crushing plant is an installation that meets the required production requirements, operates at competitive cost, complies with today’s tough environmental regulations, and can be built at a reasonable price despite the rising costs of equipment, energy and construction labor.