Issue link: http://read.dmtmag.com/i/75471
On Our Cover: According to our survey, more than 35 percent of haul trucks have logged more than 7,500 hours of use. Cover photo by Kerry Clines. Wheel tractor-scrapers are built for durability and long life, but they have many moving parts that must be maintained properly to ensure reliable operation and high productivity. 36 12 Superior Industries' new Geotrek Conveyor is a track-mounted radial stacker that can be linked directly with portable crushing and screening equipment in applications that require material stockpiling. CONTENTS AUGUST 2012 VOLUME 17, NUMBER 8 As operators defer capital expenditures, iron continues to age, but our exclusive survey shows that operators are beginning to expand capital expenditures. To help attendees maneuver through the wide assortment of mining equipment at the show, we've highlighted aggregate-related items on display. 18Aging Aggregate Equipment 28MINExpo Must-Sees FEATURE ARTICLES Select the right machine for the job and maintain it according to plan to achieve the lowest owning and operating costs and the lowest cost per ton. Check out this gathering of drills and drilling equipment available for use in aggregate production. 36Keep Scrapers Running Strong 40Dynamic Drilling WEB EXCLUSIVES Visit www.aggman.com for expanded editorial coverage. Bear With It New bearing technology helps resolve age-old conveyor challenges. More MINExpo Must-Sees This show is so big we couldn't keep it all in print. Check out even more equipment/products planned for display at MINExpo. OPERATIONS ILLUSTRATED 23Expert Advice on Lower your plant emissions. Emissions COLUMNS & DEPARTMENTS 3 5 9 12 17 17 42 44 46 48 EDITORIAL Following the passage of MAP-21, just say, "Thank you sir, may I have another?"committee. AGGBEAT The latest information on the passage of MAP-21, and other industry news. STATE AND PROVINCE NEWS A roundup of the latest news in North America. ROLLOUTS CEMCO/McClanahan's portable frac sand plant and other new equipment for the aggregate market. SAFETY WATCH Pre-operation inspections are vital to ensure equipment is in good operating condition. DATA MINING The latest fi nancial analysis of issues impacting in the industry. ROCK LAW Operators can be required to hand over documents they are not even legally required to keep. CLASSIFIED ADS Aggregate industry classifi eds. ADVERTISER INDEX See who's who and where to fi nd their products. CARVED IN STONE Development doesn't have to encumber aggregate resources.