The Alta Floresta Gold Province (“AFGP”) is located in the south-central portion of the Amazon Craton (Almeida, 1978; Almeida et al., 1981), a crustal segment north of South America that would have stabilized at 1.0 Ga, which is surrounded by the mobile Neoproterozoic mobile belts of Tucavaca (in Bolivia), Araguaia-Cuiabá (Central Brazil) and Tocantins (northern Brazil) (Almeida et al., 1976; Cordani et al., 1988; Tassinari & Macambira, 1999). As the AFGP covers an area of approximately 430,000 km2, it represents one of the largest cratonic regions on the planet, comprising two Precambrian shields: Central Brazil (or Guaporé) and Guiana shields, that are separated by the Paleozoic Solimões-Amazonas(Tassinari) basin (Macambira, 1999; Dardene &Schobbenhaus, 2000; Tassinari et al., 2000).

The Alta Floresta Gold Province (AFGP) is mostly comprised of plutono-volcanic sequences generated in paleo- and mesoproterozoic continental arcs, in addition to deformed and metamorphic units in restricted greenschist facies to its central and northwestern portions. The units that comprise the province, especially its eastern segment, are essentially represented by oxidized calcium-alkaline plutonic and volcanic rocks, of medium to high potassium (K), meta- to peraluminous, belonging to the magnetite series (type I granites). of volcanic, sub-volcanic and alkaline granitoids (type A granites).

According to Assis (2015), in general, these units can be grouped into four ma ........

The mining operation concept for the Matupá Project is conventional open pit mining with a production schedule that provides an initial 0.4 Mt stock of ROM with 0.93 g/t Au content, equivalent to three months production. For commissioning purposes the Low-Grade ore will also be available as process plant feed.

The mine development is planned to allow access to those grade levels required to maximize gold production and provide operational flexibility by mining several benches simultaneously.

The waste rock comprises soil, saprolite, altered rock mass, and fresh rock. The planned excavation of these deposits is to drill and blast, with explosives, all fresh rock and 30% of saprolite. Load and haulage will be performed mainly by hydraulic excavators, backhoe configuration, a complement of front-end loaders, and on-road transportation by a fleet of trucks (vocational).

• A minimum mining width of 30 m on a 10 m-high bench has been used. The X1 pit will include a final bench access incorporating an operational mining width of 15 m to maximize access to the mineralized zone.
• The waste and ore benches will be mined as 5 m thick layers, leaving a designed 10 m maximum bench height.
• The ore and waste zones have been analyzed and it is possible to operate with a proper berm width and in-pit dumping operational space.
• The benches will have a slight decline from crest to the toe for the upper bench face slope, in the direction o ........

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The water pump system selected is driven by diesel engine (so called "Moto-Bomba"), with 200 m3 /hour water pumping capacity at 50 HP for the rainwater drainage system in the mine pit. The system was quoted and included in capital costs. The pumping system is scheduled to start operating in the beginning, in the first year of mining operation, and will be able to accommodate the rainwater pump drainage system needs during all the pit Life of Mine (LOM).

The necessary pipes calculated for the rainwater pumping system, to pump the rainwater from the mine pit to the water treatment station, reached a length of 600 meters, using 6 inch diameter pipes.

RAW WATER
An estimated 25 m3 /h of raw water will be consumed in the processing plant. Such a flowrate will be pumped from the Porcão River, which is located close to the future industrial installations. The raw (make-up) water characteristics of low salinity, low conductivity, and low particulate solids are particularly suited to be used in the following applications:
• Pump sealing;
• Mill system sealing;
• Cooling the mill's hydraulic system;
• Preparing reagents;
• Carbon acid washing and elution;
• Safety devices such as eye washing;
• Dust suppression;
• Sprinkler and hydrant fire preventing systems; and
• Safety showers and other similar applications.

RECIRCULATE WATER
The majority of water consumed in the processing plant is designed to derive from recirculation within the industrial installation. Accordingly, a calculated 206 m3 /h water flow rate obtained from tailing thickening and filtering will recirculate to supply mainly the grinding stage.