Backfilling Trenches and Other Excavations, · Backfilling is the process of putting the soil back into a trench or foundation once excavation, and the related work has been completed. The backfill process requires skills and heavy equipment as well as knowledge of the specifications, contract requirements, and ...How Is Iron Extracted From the Earth?, · Iron ores in the form of hematite (ferrous oxide) and magnetite are removed from the earth through mining. The use of heavy mining equipment is necessary to dig out large pits in an area with a large deposit of iron ore; however, because iron does not occur ...You Can Consciously Transform Your Company Culture, · Your corporate culture has a significant impact on whether or not your company accomplishes its most significant goals. You may need to tweak the culture, or you may need a complete culture overhaul. Although changing your organizational culture can feel like rolling rocks uphill, it will likely result in increased growth and revenue.Ancient Mining Tools and Techniques, · Slow-going and dangerous it may have been, but ancient mining techniques were clever. The earliest mines sought cosmetic pigments for funerals. Picks and hammer stones are examples of stone age tools. Later, ancient man discovered metals which providedHow to Identify Igneous Rocks: 8 Steps (with Pictures), · If your rock has visible grains, proceed to the next step to classify your rock based on grain type. If there are no visible grains, use the following criteria to classify your rock: Igneous rocks are very dense and hard. They may have a glassy appearance..
How to Polish Quartz Crystals: 12 Steps (with Pictures), · When first dug out of the ground, quartz crystals do not have the sparkling clear crystal-like appearance that they do if you were to purchase one from a rock shop. Recently mined crystals or crystal clusters are often caked in clay or...Friable Loam: The Ideal Lawn Soil and How to Get It, · The directions are more in-depth but the overall idea is you create a ball of moist soil in your hand and by following a flow chart of simple questions you can determine the textural classification. (On a side note, this was one of my favorite tests to perform when I was classifying soils as a graduate agronomy student!What Are the Four Stages in Coal Formation?, · Stage two of the coal formation process is lignite. Lignite forms when peat is put under considerable vertical pressure. It contains small amounts of plant matter and is very fragile so it must never be handled before burning. Bituminous coal is the third stage ofP&Q University Lesson 7, · A hard rock application is going to require more maintenance on top of standard maintenance, as there will be more vibration, more dust and more wear than from a softer aggregate. Due to the nature of its purpose, from the moment a mobile crusher starts, the machine is wearing itself out and breaking itself down.Igneous Rocks: Everything You Need to Know, · Igneous rocks are classified by the minerals they contain. The main minerals in igneous rocks are hard, primary ones: feldspar, quartz, amphiboles, and pyroxenes (together called "dark minerals" by geologists), as well as olivine, along with the softer mineral.
Everything You Need to Identify Rocks, · Soft rock does not scratch steel but will scratch fingernails (Mohs scale of 3 to 5.5), while very soft rock won't even scratch fingernails (Mohs scale of 1 to 2). Rock Identification Chart Once you've determined what type of rock you've got, look closely at its color and composition.Streak (mineralogy), · The streak of a mineral is the color of the powder produced when it is dragged across an un-weathered surface. Unlike the apparent color of a mineral, which for most minerals can vary considerably, the trail of finely ground powder generally has a more consistent characteristic color, and is thus an important diagnostic tool in mineral ...Urethral Stent Placement, · WHAT YOU NEED TO KNOW: What do I need to know about urethral stent placement? Urethral stent placement is a procedure to open a blockage or stricture (narrowing) of your urethra. The urethra is the tube that carries urine from your bladder out of your body.