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DECEMBER 2011 FEATURE STORIES:
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“Sweet Spot” Engineering
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Clearing the Air
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Underground Communications
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Portland (Ore.) CSO Control Program Is Finished
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Gold Mining in Alaska
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“Sweet Spot” Engineering
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High-Altitude Hole Through
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If anyone has ever played baseball you will quickly recognize what it means to hit the ball on the “sweet spot” of the bat. 
Safety. It’s a word that’s emphasized in some professions more than others. When you are in a foreign environmental dealing with unknown conditions, safety is – not surprisingly – the top priority. And so it is with underground miners, a specialist group that strives to create a safe environment on a daily basis.
The marketplace for both communications and tracking and worker safety products is crowded. To make the best decision you need to consider the following: Which products are the best? Which have the lowest cost of ownership? How well does the vendor support the customer after the sale? What are the benefits of a certain technology on the jobsite? Is it the right solution for crews? 
The City of Portland, Ore., has completed its 20-year program to control combined sewer overflows (CSOs) to the Willamette River and Columbia Slough. An order from the Oregon Department of Environmental Quality (DEQ), originally issued in 1991 and amended in 1994, required the city to control CSOs by Dec. 1, 2011.
One hundred twenty years ago, gold was discovered at Comet Beach, 45 miles up the coast from Juneau, Alaska. From this beach, a mountain rises gradually at first, then steeply to a peak about two miles inland at just over 3,000 ft above sea level. 
If anyone has ever played baseball you will quickly recognize what it means to hit the ball on the “sweet spot” of the bat. 
After four years of extreme excavation through high cover and volcanic rock conditions, TBM tunneling at the Olmos Trans-Andean tunnel is complete. 
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