Introduction to Prospecting. Session Four Ore Deposits
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1 Introduction to Prospecting Session Four Ore Deposits
2 Ore Deposits What is ore? Common elements such as gold, copper, zinc and lead occur naturally in all rocks, however in very low quantities. Ore is essentially rock that has concentrated amounts of these elements. An ore deposit is an area that has undergone these specific processes to concentrate larger amounts of a certain commodity (i.e. a greenstone belt) and can be mined at a profit.
3 GOLD Meadowbank Mine
4 GOLD IRON Meadowbank Mine
5 GOLD IRON BASE METALS Meadowbank Mine
6 GOLD IRON BASE DIAMONDS METALS Meadowbank Mine
7 Ore Deposits GOLD IRON BASE DIAMONDS METALS How does ore set them apart?
8 Mine Design
9 Mine Design
10 Mine Design
11 Mine Design Lac des Iles Mine Thunder Bay, ON Open Pit
12 Mine Design Underground (Shaft) David Bell Mine Marathon, ON
13 Mine Design Doris Lake Portal (Hope Bay) Nunavut Underground (Ramp)
14 Mine Design Diavik Mine Design Combination
15 Mineralization There are several forms of mineralization, from veining to banded formations, to massive deposits. Typically, metals are found associated with another mineral and must be separated gold can be associated with quartz and iron sulphides. Other times, metals are chemically bonded to other elements, and must be chemically separated copper in the form of chalcopyrite (CuFeS 2 ).
16 Mineralization Chromite Seams Iron Formation Massive Sulphide Chalcopyrite in Quartz Stockwork Mineralization Copper Mineralization
17 Types of Ore Deposits Ore deposits come in many different shapes and sizes. The concentration of different commodities depend on very specific factors, ranging from the tectonic setting, heat and the influence of water. Gold can occur in several different forms associations with quartz and iron sulphides (i.e. pyrite, chalcopyrite, pyrrhotite) is a good example fluids. Iron can occur in different forms as well, from a well banded iron formation to massive magnetite deposits (e.g. Mary River Mine).
18 Lode Gold (vein-hosted) Deposit Broken cracks in the rock allow newly formed fluids to pass through easily. These fluids are often composed of silica (i.e. quartz veins). Most vein deposits will occur within or in the vicinity of faults zones.
19 Lode Gold (vein-hosted) Deposit
20 Lode Gold (vein-hosted) Deposit Shear zones contain faults that occur when the rock is still plastic. The shearing effect creates small spaces in areas of compression and tension. Fluids can seep into these spaces and form veins upon crystallization.
21 Lode Gold (vein-hosted) Deposit Folds have different pressure areas. You will find that many projects are centered around fold noses - i.e. where the rock bends.
22 Lode Gold (vein-hosted) Deposit Lode gold is also associated with Banded Iron Formations (BIF), as quartz veins within bands of iron and chert. While BIFs are a primary source of iron they represent the most important source globally they are also known host to gold.
23 Lode Gold (vein-hosted) Deposit The complex horizons of BIF can be very tightly folded and complex. This complexity can create many structural traps for gold-bearing fluids to enter.
24 Banded Iron Formation These iron formations are classified as chemical sediments formed by iron and silica falling out of seawater onto the seafloor. Each layer is often only centimetres-wide with sedimentary rocks alternating with iron-rich and chert layers, giving it a banded look.
25 Volcanogenic Massive Sulphide Deposit (VMS) Volcanogenic Massive Sulphide deposits are commonly referred to as VMS deposits. Ancient deposits that originally occur on the seafloor near tectonic plate margins, specifically spreading centres. This is one of the few processes that we can still observe today.
26 Types of Ore Deposits Volcanogenic Massive Sulphide Deposit (VMS)
27 Volcanogenic Massive Sulphide Deposit (VMS) VMS deposits are associated with volcanic belts, which represent periods of volcanism. Commonly referred to as greenstone belts. In Nunavut, they re commonly found in the Kitikmeot region (i.e. Hackett River, Izok Lake & High Lake).
28 Sedimentary Exhalative (SEDEX) Deposits Sounds complicated essentially created in a system similar to VMS, however without black smokers. Instead of being derived from seafloor recirculation of saltwater, SEDEX deposits are derived from continental saltwater, are recirculated, re-surface along fault lines and are eventually deposited as sediment.
29 Sedimentary Exhalative (SEDEX) Deposits Much rarer form of deposit than VMS, but essentially much larger as well. The key difference between VMS and SEDEX is that the source of SEDEX is typically a salty brine created in shallow seas. VMS deposits are related to seafloor volcanism, while SEDEX deposits are not.
30 Layered Magmatic Intrusions There are a few places in the world which host to Large Igneous Intrusions. These igneous intrusions originate from the upper mantle, typically through a massive event. Nickel-Copper-PGE.
31 Layered Magmatic Intrusions For layered magmatic intrusions, magmas coming up from the mantle have to be rich in sulphur (S). Elements such as nickel, copper, platinum and palladium will readily bond with sulphur. As they re paired together, they become denser and sink, creating a layered intrusion.
32 Uranium Deposit Like all other mineral commodities, uranium is found in rock Typically found as UO 2 (uraninite or pitchblende). UO 2 is often processed into yellowcake, which is mostly U 3 O 8 and considered a more stable form or uranium ore. The radioactivity of yellowcake remains low until concentrated for energy purposes.
33 Uranium Deposit Uranium ore is a unique commodity, in that it can occur in over 15 (basic) geological environments. Most of the uranium in Canada are formed in unconformityrelated geological environments. Primarily mined for use as an energy source after it is processed and concentrated.
34 Types of Ore Deposits Nuclear Energy
35 Types of Ore Deposits Nuclear Energy
36 Types of Ore Deposits Rare Earth Deposit With the advent of green energy, rare earth elements (REEs) are becoming increasingly popular. Lithium & tantalum are prime examples. Rare earth minerals are commonly associated with pegmatites a particular form of granite.
37 Rare Earth Deposit Most pegmatites are composed of quartz, feldspar and mica. Smaller pegmatites may host gemstones such as aquamarine (blue beryl), tourmaline and topaz.
38 Types of Ore Deposits Rare Earth Deposit Pegmatites are granites with unusually large crystals (more than 2cm) Derived from an igneous source with a lot of fluids and time for crystal growth.
39 Kimberlites Diamonds are associated with a very specific type of volcanic rock called kimberlite. Kimberlite formed at extremely deep depths (relative to other deposits) and have a very unique composition/mineralogy. Diamonds are the hardest naturally occurring mineral on Earth (10 on Moh s scale).
40 Kimberlites The kimberlite pipes, are carrot shaped igneous body in the ground. Many kimberlites have a circular shape at the surface, and the indentation created by the rapid erosion of the rock often fills with water, creating a lakes.
41 Types of Ore Deposits Kimberlites The specific type of volcano in which diamonds Not are all found are called kimberlite pipes. kimberlite Essentially carrot shaped igneous body in the ground. pipes are Kimberlite pipes are derived from deep within the mantle. circular! Many kimberlites are almost perfectly (North circular, Arrow s and the indentation Qilalugaq of the Project) volcano usually fill with water.
42 Kimberlites Kimberlites can be recognized using KIMs (kimberlite indicative minerals). For example: Olivine Pyrope (Garnet) Chrome Diopside Another rock, called eclogite is entirely composed of olivine and garnet, also may contain diamonds.
43 Types of Ore Deposits Kimberlites As kimberlites are from a unique place, they tend to have a unique composition of minerals. There can be quite obvious indicator minerals for kimberlite. Olivine Pyrope (Garnet) Chrome Diopside A very specific rock called an eclogite is entirely composed of olivine and garnet, which is why it s known as the Christmas rock. Ore Deposits
44 Placer Deposit Placer deposits are not created by any volcanic or igneous process. Created by the weathering of an actual deposit. Typically found in the bends or other low velocity areas of streams and rivers.
45 Placer Deposit
46 Placer Deposit
47 Carving Stone Soapstones are typically ultramafic soft rocks that can be easily be carved without breaking, relative to other rocks. Marble is also commonly used as carving stone, dominantly composed of calcite or dolomite.
48 Meteorites Meteorites themselves are not considered ore. Meteorites represent material from the beginnings of the solar system unaltered by geologic forces. Companies are beginning to determine the potential for ore in asteroids, particularly for iron.
49 Other Types of Deposits Meteorites Meteorites themselves are not considered ore. Meteorites represent material from the beginnings of the solar system unaltered by geologic forces. Same material that comprise asteroids Companies are beginning to determine the potential for ore in asteroids, particularly for iron. Geologists may refer to meteorites being of chondritic material, meaning made of original material of the solar system. Sudbury, Ontario Ore Deposits
50 What Did We Learn?
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