Aggregates Manager

September 2013

Aggregates Manager Digital Magazine

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by Bill Langer Bill Langer is a consulting research geologist who spent 41 years with the U.S. Geological Survey before starting his own business. He can be reached at A Taste of In Stone BARITE As prices continue to rise, our erstwhile columnist shares his gut feeling about the mineral's future. I am intimately familiar with a mineral called Barite, a.k.a. barium sulfate. This is because I recently underwent a computed tomography (CT) scan that used X-rays to make detailed pictures of the inside of my mid-section. X-rays pass right through skin and soft tissue, so I prepared for the CT by drinking a barium sulfate 'smoothie.' Ultra-pure barite works well for CTs because barium has a high atomic number of 56, which is the number of protons and electrons in the atom. When X-rays go through barite, they interact with the cloud of electrons around the barium atoms, and the barium electrons stop the x-rays. Also, barite is uncommonly dense, so it packs more protection into a smaller volume. The poorly-flavored, finely-ground barium sulfate-water mixture traveled down my throat, into my stomach, through my intestines, and ultimately out 'the back passage.' The barium sulfate coated the lining of the digestive tract so the doctor could see if anything was wrong inside me. The specific gravity of barite is 4.5 grams per cubic centimeter — about twice that of most common industrial minerals. Indeed, the name barium comes from the Greek barys, meaning 'heavy.' The high density of barite makes it indispensable for the oil and gas industry where it is ground up and added to drilling mud to help counteract the high pressures encountered while drilling deep wells. Doctors and well diggers love barite because it is non-reactive. It just sits there counteracting pressure or impeding X-rays. Even in the stomach or intestines, which are designed to digest stuff, it just passes right on through. Barium's name is derived from the Greek barys, Obviously, a whole lot more ground-up barite goes into drilling wells than into barite which means heavy. It is about twice as heavy as most 'smoothies.' The United States used 3.3 million metric tons of barite during 2012. The many industrial minerals. other uses for barite include filler in paint, plastics, and rubber; powder coatings; automotive brake pads; and heavy aggregate for radiation shielding concrete. Even so, 95 percent of barite went into well-drilling. About 80 percent of the barite consumed in the United States is imported; mostly from China. Many importers ship barite from China to Gulf Coast ports where most of the barite grinding mills are located. That ground barite is shipped to offshore drilling operations in the Gulf of Mexico or onshore operations in Louisiana, Oklahoma, and Texas. Most barite mined in the United States comes from Nevada, is ground in Nevada or Wyoming, and sold to petroleum-drilling customers in Colorado. Barite commonly is shipped by freighters in lot sizes greater than 50,000 tons. At times, suppliers cannot acquire that much high-quality barite, so they add lower quality barite to the shipment. This results in inconsistent product quality that must be addressed at the U.S. mills. Ocean freight rates are high, and congestion in Chinese ports causes delays. Accidents and deaths in China's mining industries have prompted the government to enforce regulations more comparable to U.S. regulations. China is keeping more barite for its own uses, and some local and regional authorities have reduced production from mines. All these factors, as well as other factors, drive up prices. For example, the price per metric ton of barite loaded on a ship in China was about $72 to $75 during October 2010, but had doubled to $146 to $158 by October 2012. This is just a taste of the barite industry. It's a pretty complicated business, and something tells me it is not going to get any more simple. I feel it in my gut. 32 AGGREGATES MANAGER September 2013 Carved_AGRM0913.indd 32 8/14/13 2:18 PM

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