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Looking for an engaging and educational geology quizzes? Test your knowledge and expand your understanding of the Earth’s composition, rocks, minerals, and geological processes with our interactive geology quiz. Challenge yourself and see how much you know about geology. Start ...
Geology 101 is the study of the Earth and its materials, structures, processes, and history. It is a broad field that encompasses many different disciplines, including mineralogy, petrology, paleontology, and geophysics. Geologists study the Earth’s physical features, including its rocks, ...
What is VMS? Assemblages of mostly sulfide minerals that develop on the seafloor at locations of concentrated hydrothermal discharge, relates to a kind of ore deposit that’s mined from existing oceanic crust formed underwater are Volcanogenic Massive Sulfides (VMS) Deposit. ...
Explore a comprehensive collection of Mining Geology Multiple Choice Questions (MCQs) for a thorough understanding of geological concepts in the mining industry. Test your knowledge and enhance your expertise with this curated set of questions, designed to cover key topics ...
Geology is the study of the composition of the Earth’s surface and under it and the events that have shaped it. It also includes methods for determining the absolute and relative ages of rocks discovered in a certain place and ...
Geology is the scientific study of the Earth, including its composition, structure, processes, and history. This fascinating field encompasses a wide range of disciplines, including mineralogy, paleontology, seismology, and more. Geology trivia questions are a great way to test your ...
Geology MCQs (Multiple Choice Questions) online are a great resource for students and professionals to test their knowledge and understanding of various geological concepts. These MCQs cover a wide range of topics in geology such as plate tectonics, rock formation, ...
Geology online Quizzes questions and answers. Free online quiz with multiple-choice questions (MCQ) without registration. Geology Multiple Choice Questions geology questions and answers | geology questions for competitive exams | geology exam questions. Geology quiz questions and answers.geology quizes. Geology ...
Igneous rock is a category of rock formed through the cooling and solidification of magma, which is molten rock that originates from the Earth’s mantle. This process, known as igneous differentiation, results in the formation of a wide range of ...
Carbonate Replacement Deposits (CRDs): Unraveling Earth’s Subterranean Wealth Carbonate Replacement Deposits (CRDs) represent a fascinating chapter in the geological story, revealing the hidden treasures of valuable metals beneath the Earth’s surface. These deposits, shaped by complex geological processes, are crucial ...
Skarn Deposits: Unraveling the Geological Marvel Skarn deposits, also known as skarns, represent a fascinating geological phenomenon formed through the interaction of hot fluids from intrusive igneous bodies with carbonate-rich sedimentary rocks. In this comprehensive guide, we’ll explore the various ...
A landslide is a geological phenomenon that occurs when soil, rocks, and debris suddenly move down a slope due to various factors such as gravity, erosion, seismic activity, or human activity. Landslides can cause significant damage to buildings, infrastructure, and ...
When we think about tunneling, we often picture massive machines and skilled laborers hard at work underground. While these elements are undoubtedly essential, there’s an unsung hero behind every successful tunneling project: the geologist. In this article, we’ll explore the ...
An unconformity is a surface of erosion or non-deposition that separates two rock units that have different ages. It represents a time gap in the geologic record, and it occurs when sedimentary rocks are tilted, uplifted, and eroded before new ...
Sand dunes are dynamic landforms created by the wind-driven accumulation of sand. They are typically found in deserts, coastal areas, and even some inland regions. Sand dunes can take on various shapes and sizes, influenced by factors such as wind ...
What is Strike? The strike is the compass direction of a line marking the intersection of an inclined plane with a horizontal plane such as the Earth’s surface. Measuring Strike In order to measure the strike, place the side or ...
Dredging is the underwater excavation of a placer deposit by floating equipment. Dredging systems are classified as mechanical or hydraulic, depending on the method of material transport. The bucket-ladder, or bucket-line, dredge has been the traditional placer-mining tool, and it is still the mostRead more
Dredging is the underwater excavation of a placer deposit by floating equipment.
Dredging systems are classified as mechanical or hydraulic, depending on the method of material transport.
The bucket-ladder, or bucket-line, dredge has been the traditional placer-mining tool, and it is still the most flexible method for dredging under varying conditions. It consists of a single hull supporting an excavating and lifting mechanism, beneficiation circuits, and waste-disposal systems.
The excavation equipment consists of an endless chain of open buckets that travel around a truss or ladder. The lower end of the ladder rests on the mine face—that is, the bottom of the pond where excavation takes place—and the top end is located near the centre of the dredge, at the feed hopper of the treatment plant.
The chain of buckets passes around the upper end of the ladder at a drive sprocket (called the upper tumbler) and loops downward to an idler sprocket (the lower tumbler) at the bottom. The filled buckets, supported by rollers, are pulled up the ladder and dump their load into the hopper.
After the valuable material has been removed by the treatment plant, waste is dumped off the back end of the dredge.
The clamshell dredge, another mechanical system, is characterized by a large single bucket operating at the end of cables.Although it can operate in deeper water than other systems and handles large particles and trash well, it has the disadvantage of being a discontinuous, batch-type system, taking approximately one bite per minute.
In pure hydraulic dredging systems, the digging and lifting force is either pure suction, suction with hydrojet assistance, or entirely hydrojet.
They are best suited to digging relatively small-sized loose material such as sand and gravel, marine shell deposits, mill tailings, and unconsolidated overburden.
Hydraulic dredging has also been applied to the mining of deposits containing diamonds, tin, tungsten, niobium-tantalum, titanium, monazite, and rare earths.
The digging power of hydraulic systems has been greatly increased by the addition of underwater cutting heads.
The cutter suction dredge has a rotary cutting head or other excavating tool for loosening and mixing soil at the face of the mine.
The material falls downward to the mouth of a centrifugal pump, and this transports the slurry (containing 20 to 25 percent solids) to the processing plant. Normally, the dredge is held in place during cutting by a pile called a spud. Winches and wire ropes are used to swing the dredge in an arc around the spud until all the material in the arc has been removed.
The dredge is then moved ahead and the process repeated. The cutter suction dredge is most suitable for mining softer deposits where the material is of a relatively low specific gravity or fine particle size—for example, in sand and gravel pits, phosphate mines, and various salt deposits.