geology

Thursday 24 November 2011

Surpac software Design Open Pit




Open Pit Slope Stability Design Using Surpac & Slide:


How SNC Lavalin Put Technology To Work For Them

Nadine Miller is a Geotechnical Engineer-in-Training with SNC-Lavalin Engineers in Toronto, an active practitioner who is savvy about using the latest software to her advantage in her geotechnical practice. “In the past, I felt frustrated by the amount of time it takes to set-up a model prior running the analysis. I’m always on the look out for ways to improve my analyses and cut my modelling time.” On a recent project, Nadine decided that the best tools were two different, but complimentary software packages, Surpac and Slide: “Using these programs, I was able to more efficiently model and analyse open pit stability.” Here Nadine describes her open pit project and explains how she was able to create a successful final stability model that has been accepted by international and third party reviewers.

“Our project area was a small-scale open pit mine located in Europe. The project was at the basic engineering stage and there were plans to eventually do conventional open pit mining of four pits for precious metals. We collected information for the project from the site’s original geological and geomechanical reports, from data gathered in similarly mined galleries and from our investigations of the current pit. We were able to confirm what the old reports suggested, that the pit area was well drained by existing underground mine workings: the four pits are connected at the principal mine level, with groundwater draining out of one adit that daylights in a neighbouring valley. There were three main rock types found at the location: dacite (ore bearing), vent breccia and black breccia.” SNC Lavalin’s team undertook both geological and geomechanical exploratory drilling: “In our geological program, we drilled several hundred exploratory holes to allow us to define reserves and orebodies in our mining model and less than 10 holes for our geomechanical program.” Data from these drilling programs was used to develop a mining model and to assess the stability of each pit using Surpac and Slide, respectively.

During the geomechanical program, a unique weathering pattern in the black and vent breccias and the discovery that breccia encased the dacite formation led Nadine’s team to determine that breccia lay under the dacite pit walls. They used this data to assess failure possibilities and decided that circular type failure dangers existed in the breccias, because of their similarity to soil. For the benches composed of dacite, localized failure wedge/planar failure was considered. “We undertook highwall modelling for the circular sliding surface using circular failure with the known mechanical properties of the rockmasses. The dacite, with its similarity to hard fractured rock, was analyzed using Hoek-Brown criterion. Because of its soil-like qualities, the breccias were modelled using Mohr-Coulomb. Next, we assessed ground water conditions at the pits to incorporate into the model. Using Slide’s groundwater modeling module, we were able to incorporate drainage conditions from the four open pits and the derived boundary condition based on seepage analysis preformed in an adjoining valley.” It was assumed, based on the underground workings, in the groundwater model, that the periphery of the pit would be fully drained down to the principal mine level that connects all four pits: “The interior of the pit would be drained to the pit base through de-watering; boundary conditions were based upon watershed boundary conditions. After the groundwater model was run, the results established a future water table that was used for stability analysis.”

The initial evaluation of the open pit slope stability was based on simplified geological cross-sections from the geomechanical drilling program, simplified pit geometry and preliminary pit depths based on the feasibility study. One particular section, based on a single drillhole that intersected the overall slope of the feasibility pit shell, was entirely composed of black breccia. Once the maximum overall slope angle was assessed, the mine designers proceeded to develop their pit shells using Surpac: “During discussions with the designers, it became apparent that it was possible to select a cross-section of the natural ground surface and pit shell in Surpac and export it as file in DXF format. We could also export the geological data by including it in the cross-section. Using the two programs, we were able to evaluate a section based on a larger geological database, while still using our geomechanical parameters. This gave us the

flexibility to update our model to the most recent mine design and incorporate a larger database from which we could base our rock mass contacts, final pit shell geology and corresponding sub-surface geology with little to no additional time cost.” The team then re-analyzed the updated sections based on the complete Surpac model (Figure 1). Nadine adds that for the geomechanical parameters obtained during this program, factors of safety of the pit walls were computed using Bishop’s method. She says she expects that additional iterations will be required to verify the geological assumptions used in the pit slope stability analysis during the next stage of detailed design, the result of which could even further improve and optimize the overall pit slope configuration.

Southwest Open Pit 2Northeast

Future Water Table

Black Breccia

Vent Breccia

Dacite

Figure 1 Slide Model Geometry Imported as SURPAC DXF File

After hearing about SNC Lavalin’s technology forward approach to their project, we were curious: why did they decide to use Slide in combination with Surpac? “The primary reason we chose Slide is that it allows users to import geometry from programs such as AutoCad and Microstation using a DFX format. The second reason is that the automatic mesh generation feature in Slide’s groundwater modeling module saves a lot of time. By combining two powerful engineering software packages, our modeling set-up time was reduced significantly and we produced internationally accepted results.”

Friday 11 November 2011

gold in sudan

Processing Gum Arabic




Introduction:

Gum Arabic is one of the most important cash-generating export crop in Sudan. It is one of the best of its type in the world. The project aims at processing gum Arabic, locally, to improve exports and benefit from the value-added.
- The sites producing gum Arabic in Sudan:

- Kordofan region 49.3%

- Kassala region 24.4%

- Darfur region 23.4 %

- White and Blue Nile region 2.9%

- The proposed sites for erecting the project:

Near the production collection regions.

- The productive capacity: 4000 tons per year.

- Methods of gum Arabic processing:

- The mechanical method.

- The method of sprinkle drying.

- The mechanical Method:

- Preliminary cleaning unit.

- Air cleaning and sorting unit

- Breaker.

- Refining mill and granules production mill.

- Conveyor belts.

- Packing unit with weighing machine.

- Quality control laboratory.

- Electrical control panel.

-The sprinkle Drying Method Equipment

- Dissolving container.

- Sifters with various openings.

- Sedimentation cylinder and the solution concentration cylinder.

- Drying and spraying unit.

- Cylinder drying unit.

- Solar energy unit for heating water.

- Cleaning and sorting unit.

- Quality control laboratory.

Area : Estimated at 800 m2 ; as follows:-

144 m2 Production hall.

280 m2 First cleaning shed.

48 m2 Second cleaning shed

250 m2 Stores

75 m2 Offices + utilities

Invested capital : US $ 6.628.032

Operating capital : US $ 192.247

Fixed Assets : US $ 150.735

Net profits : US $843.561

Profitability : 10 %


Period of Re-imbursement : 2 years



Raw Materials : gum Arabic – packing materials (Jute sacks)



Contact Address:



Investment Department,



Federal Ministry of Industry



Tel : 0249183777770



The Processing of Basic Chlorine



Introduction:



The Sudan is distinguished by its Red Sea shore, which provides salt. This encourage the establishment of a basic chlorine plant for the production of the following:-



- Caustic Soda: which is used in numerous industries, such as, textiles, industrial detergents, soap, edible oil refining and other industries which benefit from the characteristic of bleaching of the caustic soda.



- Chlorine: Which is used in many fields; such as, the water purifying and sterilization networks, the sewerage system networks and several other uses which benefit from the characteristic of chlorine as a disinfectant and insecticider.



- Hydrochloric acid (HCL): which is widely used as a multi-purpose acid. It is also used in large quantities for purifying the calcium carbonates from the bottom of oil wells and in petroleum refineries.



- Sodium hypochlorine: Which is used in the Weaving and spinning industry; and other purposes which benefit from its characteristic as a bleacher and pesticider.



- Productive capacity:



· Caustic soda 5 tons/day.



· Chlorine 5 tons/day.



· Hydrochloric acid 5 tons/day.



· Sodium Hypochlorine 5 tons/day.



- Invested capital US $ 2.700.000



- Raw materials:



- Sodium chloride.



- Phosphoric acid.



- Soda dust.



- Hydrochloric acid.



- Electricity.



- Man-power:



35 (direct and direct labour).



- Area of plant: 6560 m2.



- Location : It is preferred that the project shall be close to salt sources (i.e. Eastern Sudan.).



- Project’s Product users:



- Edible oil plants..



- Petroleum fields.



- Weaving and spinning plants.



- Water distribution networks.



- The average imported amounts during the last three years:-



2000 tons




- Contact Address:



The Investment Department,



Federal Ministry of Industry,



Tel: 0249 183 777770



Assembly and manufacture of



Solar Energy Equipments



Introduction:



God endowed the Sudan with a climate of less clouds and much sunshine throughout the year, therefore the Sudan is considered an ideal place for the system of transferring the light of the sun to electricity.



The Invested capital: 673653000 Sudanese Dinar



Machineries and Equipments:



- Assembly of Solar cells.



- Liquid batteries.



- Tools and Equipments.



Total cost of Machineries and Equipments:



122,000,000 Sudanese Dinar



Cost of raw materials for One Operational year:



150,000,000 Sudanese Dinar



Recovery Period: Two years



Contact Address:



Department of Investment ,



Federal Ministry of Industry



Tel: 0249183777770



Calcium Carbonate Manufacture



Introduction:



The lime stone is composed of the matter of calcium carbonate which could be grinded and purified for the extraction of pure powder of calcium carbonate, which is used in filling the plastic pipes and the plastic utensils, and also it is used in the production of insecticides and tooth paste, in addition to its use in cultivation and animal husbandry.



The proposed productive capacity: 20 ton/day.



The Investment Capital: 1,500,000 US Dollar.



The raw materials: Lime stone



The volume of employment: 450 direct and indirect employees.



The establishment area: The total area of the project is 35,000 m2.



The Location: It is preferable to establish the project near the areas where the raw materials are available and they are: Gabalain province, ‘Gabalain ‘town’ Atbara town, Sennar, Jabal Marra and any areas where the lime stone is discovered.



The Users of the Production:



- Plastic pipes production Factories.



- Plastic house utensils production Factories.



- Insecticides poweder production factories.



- Tooth paste production factories.



- The farmers.



Average of the Imported quantities during the last three years:214tons



Contact address: Investment Department:



The Federal Ministry of Industry,



Tel: 0249183777770




Concentrated Feed Manufacture



Introduction: The concentrated feed are protein and hydrocarbonic materials produced from the agricultural and processing remains and they wore divided into:



(a) Animal feed: They use the residues of legumes. Couch grass straw, Durra reeds, rice straw, residues of oil seeds like cotton seed, peanuts husks sesame sunflower, beans and the retuse of sugar factories such as Mollas, bugas and cane heads.



(b) Poultry feed: Contains fish powder, meat and bones powder and other animal remains like blood in addition to some materials used in Animal feed.



The targeted market: To cover the local market and exportation to the African and Arab countries.



The Productive capacity:



The proposed: 15,000 ton/year



The invested capital: estimated USD 1,550,000



The raw materials: Oil cake of cotton seed, wheat bran, bugas, Molas, pea-nuts husk, Dhura stalks, Calcium carbonates,



Table salt and vitamins.



The Premises area: 2200 m2



The Working force: 35 direct and indirect workers.



Average of imported quantities during the last three years:3503tons



Contact Address: Investment Department



Federal Ministry of Industry.



Tel : 0249183777770







Gold Processing Project



Umm Nyardi Mine



Location: North Wadi Half town



Annual Mining Capacity:



The Project target the mining and processing of 700 Kilograms annually.



Investment Costs: about USD 90 millions, Annual costs of production. USD 2.5 millions.



Annual Sales Returns: USD 7 million, net profits : USD 4.5millions.



Financial indicators: Net profits ratio to sales : 64%



Capital Recovery Period : about two years.



Contact Address: Investment Department



River Nile State



Tel : 0211822557







Glass Production Project



Location of the Project: Mattama Area



Mining capacity: 150 ton/per day



Project sales returns : Amounts to 17,4 million us Dollar.



Annual Production costs for the entire project:



Amounts to 9.1 million us Dollar



Financial indicators: Net profits ratio to the sales: 52%, Net profits ratio to the investment 37%



Capital recovery period: Two years







Contact Address: Investment Department



River Nile State.



Tel : 0211822557









Iron Extraction Project



The proposed Location: Bigrawiyya area



Raw materials: The raw iron belt which was formely expolcted by the pharaohs exist in the Bigrawiyya belt area with quantities not less than

750 million tons.



The targeted productive capacity: amounts to USD 100 millions.



Annual cost of production: amount to USD 362 million



Sales returns: amounts to USD 550 million



Annual net profits: amount to USD 100 million.



Financial indicators:



Net profits ratio to Sales : 34%



Net profits ratio to investment : 100%



Capital recovery period: One year



Relative advantages of the project: Electricity is considered the principal element in the costs of production as the project needs annually 3000 megawatt/hour.



The establishment of Kajbar reservoir will make available the electrical energy to this project.



Note: The establishment of the project requires the execution of geological surveys to determine the reserve volume.



Contact Address: Investment Department,



River Nile State:



Tel : 0211822557







Ceramic and Porcelain Production Project



Location of the project: South Matamma.



The targeted productive capacity:



The project aims to produce 3,000 m2 annually.



Cost of Investment: The volume of the required investment is estimated around 31,7 millions US Dollar.



The return of the project’s annual sales: 63 million US Dollar.



Costs of Production: A sum of 48,9 million US Dollar.



Annual net profits: 14.1 million US Dollar.



Financial indicators:



Net profits ratio to sales : 17.4



Net profit ratio to investments : 32.2%.



Internal return average : 39.6%



Capital Recovery Period: 3 years



Contact Address: Investment Department



River Nile State,



Tel: 0211822557







Cement Production Project



The proposed Location: Five factories will be established as follows:



· Two factories in west Berber area.



· One factory in Abu Hamad area.



· One factory in Ebiediyya area.



· One factory in Atbara town.



The designed productive capacity for each project:



Each project aims to produce 325,000 ton cement/year.



Investment for each project:



The Total investment cost: 55,1 million US Dollars.



The annual project sales, ‘ for each project’.



The project gross return when it works with full capacity:



29.2 million US Dollar.



Annual cost of production: 10.2 US Dollar.



Annual total profit for the project : 19 million US Dollar



Financial Indicators:



Net profits ratio to the Sales = 65%



Net profits ratio to the investment = 35%



Period of capital Recovery: Three year



Contact Address : Investment Department,



River Nile State



Tel : 0211822557









Mica Production Project



Location of Project: El-Shriek – River Nile State



Targeted productive capacity : 200 ton/day.



Investment Costs : 2.5 million US Dollar.



Annual Sales return : 1.2 million US Dollar



Costs of Production: 0.6 million US Dollar.



Net profits ratio to the Sales = 34%



Net profits ratio to the investment = 100%



Capital recovery period: 3 years



Contact Address : Department of Investment



River Nile State



Tel : 0211822557



http://www.sudaninvest.org/English/Projects-Industry.htm

investment the gold in Sudan

The possibility of  investment the gold in Sudan

Sudan issues 50 more gold exploration licenses
Sudan's govt. has issued 50 licenses to 73 firms to explore gold and other minerals, as it tries to grow its small gold production to compensate for the loss of most of its oil reserves to newly independent South Sudan.

Posted: Monday , 31 Oct 2011
KHARTOUM (Reuters) -
African gold producer Sudan has handed out 50 more licenses to 73 firms to explore gold and other minerals, state news agency SUNA said on Sunday.

Sudan is trying to expand its small gold production to compensate for the loss of most of its oil reserves to South Sudan which became independent in July.

The new licenses allow gold exploration in around eleven states, Minerals Minister Abdelbagi Gailani Ahmed told SUNA, adding that now seven firms were producing gold. The rest is still at the exploration stage.
To date, Sudan has handed out around 200 gold exploration licenses.
Ahmed reiterated Sudan would build at the start of next year a refinery with capacity of 150 tonnes of gold and 30 tonnes of silver.
In total, Sudan expects to produce about 70 tonnes of gold in 2011, he said. Only an estimated 6 to 7 tonnes gold will come from regular mines. The rest is being produced by more than 200,000 local Sudanese attracted by a gold rush whose exact output is hard to verify