Mineral Exploration and Development

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Presentation transcript:

Mineral Exploration and Development Group 6: Honrubia, Ma. Caryl C. Hilario, Jhon Kelly B. Marqueses, Alexandra Marie L. Niog, Nicamae E.

What is mineral exploration? Mineral exploration is the process of finding ores to mine. Mineral exploration is a much more intensive, organized and professional form of mineral prospecting and, though it frequently uses the services of prospecting, the process of mineral exploration on the whole is much more involved.

Ores An ore is a type of rock that contains sufficient minerals with important elements including metals that can be economically extracted from the rock. The ores are extracted from the earth through mining; they are then refined (often via smelting) to extract the valuable element, or elements.

Stages of Mineral Exploration and Development 1. PROSPECTING AND EXPLORATION Prospecting- Prospecting is a small-scale form of mineral exploration which is an organized, large scale effort undertaken by commercial mineral companies to find commercially viable ore deposits. Prospecting is physical labor, involving traversing (traditionally on foot or on horseback), panning, sifting and outcrop investigation, looking for signs of mineralization. In some areas a prospector must also make claims, meaning they must erect posts with the appropriate placards on all four corners of a desired land they wish to prospect and register this claim before they may take samples. In other areas publicly held lands are open to prospecting without staking a mining claim.

Prospecting and exploration for precious metals, base metals, minerals and diamonds usually begins with research to select target areas for exploration and taking samples from areas that look like they might have minerals. Exploration includes prospecting, mapping and surveying, either on the ground or from a plane or helicopter, where special equipment measures the magnetic or electrical properties of rocks on the surface and underground (subsurface). Airborne surveys are done in the winter or spring to gather data for the summer exploration season. If the information collected from the surveys indicates something out of the ordinary (an anomaly) in specific location on-the-ground work is done.

A prospecting team, normally two people, will visit each anomaly to see if minerals are present on the surface. They then take grab samples (fist-sized samples of the mineralized rock) for assay (analysis) to identify and measure the presence of base and/or precious metals. Other sampling methods include taking rocks, soil, till (gravel), and lake sediment with a sample spacing of hundreds of meters. If analysis indicates there might be something of interest, more closely spaced sampling would be done. This kind of sampling normally takes place on mineral claims staked around the anomalies; smaller parcels of land than those covered by a prospecting permit. A company invests approximately $1.75 million per project per year. This phase is three to five years.

2. DISCOVERY AND ADVANCED EXPLORATION - Discovery and advanced exploration happens when something of value is actually found. At this stage, higher impact activities such as further ground geophysics, channel sampling, trenching and diamond drilling, generally take place. This work is usually conducted on a mineral claim or lease. It is at this stage where permits, leases and licenses are required and where the project may be referred for environmental assessment. Very few discovered mineral deposits become producing mines. It may take between 10 to 15 years or more for a mine to be developed. In the North, operation challenges such as limited infrastructure, including roads and power, as well as associated costs such as fuel, transportation, materials and labour, make it much more difficult to move beyond this stage. Most projects never get past this stage.

Approximately $5 million per project per year is spent at this stage of mineral exploration. This stage may last from 5 to 15 years. *THRESHOLD LIMITS – certain kinds of work can take place without land use permits and water licenses being required. Most of this is low-impact and below threshold limits set by Department of Environment and National Resources (DENR). When determining threshold limits, the following work and activities are considered: the amount of fuel and explosives, the number of working days, the size of buildings, the weight of equipment and vehicles, deposit of waste, direct use of water, water crossings such as roads and bridges and water flow. If the proposed work and activities are going to be above the threshold limits, land use permits and water licences are required. 

3. DEVELOPMENT/CONSTRUCTION - Development/construction is next if, based on economics (is an area or deposit worth mining), and if shareholders approve, a company decides to go ahead with the project. During this stage the company raises money in order to begin construction and develop a mine. This is the most expensive phase of the mining cycle. - On average, this stage costs approximately $1.5 billion and may take three years or more years to complete.

4. OPERATION AND PRODUCTION - Operation and production is the actual mining, milling, and processing of the metal, ore or diamonds. The length of time a mine is in production (the mine life) depends on the amount (reserves) and quality (grade) of the mineral, metal or gems and whether the operation is still profitable. - It is at this stage that companies start to see a return on their investment (make some money). But they still have expenses (operating costs) such as wages, fuel, transportation, equipment and maintenance in order to keep the mine running.

5. RECLAMATION - Reclamation of a site and protection of the environment starts at the beginning of the project. - All existing and new mines must have closure and reclamation plans and are required to set aside in a trust, the total estimated reclamation costs. - The goal is to protect the environment right from the beginning, to make sure the site is as productive as possible and safe for people and animals when the mine closes.

- It typically takes two to ten years, or more, to shut down a mine and clean up the site. This usually costs upwards of $150 million – depending on the size of the mine and what kind of on-going clean up has been done during the life of the mine.