Paige Taylor; 23/11/09
Phosphate mining sustained Adijah Bingham and her seven siblings as they grew up on the remote Australian territory of Christmas Island. Now Ms Bingham’s work replanting native trees is paid for by a mining company holding its breath. Within five weeks, Environment Minister Peter Garrett is expected to rule on the future of Christmas Island Phosphates, which, despite the economic boom created by the detention of more than 1100 asylum-seekers on the island, is still the largest employer of locals. The mine employs 135 residents and has offered to contribute a further $50 million to community projects on top of the conservation levy it pays for rainforest rehabilitation if its new leases are granted.
See: http://www.theaustralian.com.au/news/nation/work-the-issue-as-islanders-hang-on-garretts-mine-call/story-e6frg6nf-1225801855374
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Chilean chemical solutions firm Sinquiver is looking into marketing urine separation systems in Chile, the firm’s wastewater manager Alistair Marsh told BNamericas.
There are several advantages to the system, according to Marsh. “First of all, you don’t need freshwater to flush urine so you save on water use and costs,” he said.
The concept involves installing a different pipeline which would channel the urine to be stored in a tank. “Urine is a huge source of nitrogen and phosphate which could then be used for the production of fertilizer,” Marsh said.
“This kind of system would be especially useful in mining operations which involve a large number of people,” said Marsh, adding: “It would save water while simultaneously providing a source of fertilizer for local farmers.”
An additional benefit is that by taking the urine out of sewage, wastewater is easier to treat.
Urine accounts for less than 1% of wastewater but it contains about 80% of the nitrogen, 50% of the phosphate and 70% of the potassium, all of which must be removed. Nutrient removal is the most difficult aspect of wastewater treatment. By separating the urine at source, studies have shown energy savings of 25% at wastewater treatment plants.
“We are looking to offer urine-separating toilets to municipalities and companies that employ a large number of people such as malls and hotels, among others,” Marsh said.
“Wastewater treatment is still very new in Latin America but there is a great need for it and that is where we come in,” said Marsh, adding: “Sinquiver is looking for the best technology and solutions to introduce into the local market.”
In addition to wastewater treatment, the company provides solutions for the wood and paper industry, and sells industrial equipment.
Source: Greta Bourke, BNamericas.com [subscription site], 19 Nov 2009
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Santiago, Chile - Workers at the world's largest copper mine made landmark progress in their ongoing labor dispute, winning thousands of dollars in bonuses and higher wages for unionized members. The Escondida mine, located in the Atacama Desert in northern Chile, will pay each of its workers a bonus of US$25,340, give them a 5 percent raise, increase their health and education benefits, and provide easy access to up to US$6,339 in loans. The union, which has roughly 2,250 members, voted to accept the offer with a 72 percent yes vote. The union contract was set to expire Dec. 5.
This latest concession by Escondida, which is owned by British/Australian mining giant BHP Billiton and produces 5 percent of the world's copper, will almost certainly influence labor negotiations at other Chilean mining sites, including Spence, another BHP Billiton mine, and the Andina division of state-run copper company, CODELCO.
At Spence, where the workers are on strike, union leaders are demanding benefits above those won in Escondida. “We're open to resuming the dialogue, but we're warning that we can afford to continue striking for months,” union leader Andrés Ramírez told El Mercurio. He said that his union was not blocking access for workers or vehicles entering the mine.
Still, Escondida's successes will not necessarily carry over to the other labor disputes, according to Juan Carlos Guarjardo, director of the Santiago-based Center for Copper and Mining Studies (CESCO). “I don't think it's possible to extrapolate the same numbers to all cases, but it will play an influential role in establishing a higher level of demands,” he said to El Mercurio, pointing out that several mining contracts will end later this year, which puts the Escondida settlement at the center of the mining industry's attention.
Escondida workers fought for higher wages in 2006 as well, and, after a 25-day strike, won a bonus of US$16,290 and a 5 percent wage hike.
Copper has long been the lynchpin of Chile's economy. According to the Chilean central bank, in 2008 copper represented 42.49 percent of Chile's exports and 15.5 percent of its gross domestic product.
SOURCES: EL MERCURIO, CAPITAL, REUTERS, THE AUSTRALIAN
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The DSS allows users to enter variables in yellow cells in the “Inputs” section on the left side of the worksheet and view results in green cells in the “Outputs” section on the right. Input variables include stumpage price, capital cost, and costs of each start-up, rotation, coppice, and year. The user can specify what portion of total biomass is harvested, the number of coppices, and their harvest ages. Financial incentives for renewable energy or other environmental benefits can be incorporated on a per-ton basis in the stumpage price. The DSS uses growth and yield functions developed from measurements of two planting densities of Eucalyptus amplifolia in a field trial of SRWCs on a phosphate mine clay settling area (CSA) near Lakeland, FL. Yields for each growth stage are displayed, and can be modified by adjusting the initial planting density or by adjusting yields under the general parameters. Ranges of values used to assess SRWC production on CSAs are shown in Table 1.
Under all possible combinations of the assumptions in Table 1, the profitability of E. amplifolia on CSAs varies widely, with LEVs ranging from -$909 to $6,740 acre-1. Under the base case scenario identified in Table 1, the resulting LEV is $308 acre-1 assuming an interest rate of 10% and $2,633 acre-1 assuming an interest rate of 4%. LEV, EAE, and IRR results of the base case scenario under a range of discount rates and stumpage prices are shown in Table 2.
This DSS does not automatically determine optimum harvest ages or the optimum number of stages per cycle, which both require dual optimization of continuous functions. DSS users can either input probable harvest and replanting ages and “zero in” inputs to maximize economic returns, or contact the authors to arrange a customized DSS. The DSS in either Excel or MathCad format could be modified to incorporate alternative growth and yield functions that might be developed for other SRWC species or conditions. For more information see the FIPR report “Commercial Tree Crops for Phosphate Mined Lands”, Rockwood et al. (in press).
Acknowledgements
We acknowledge the assistance of Steve Segrest of the Common Purpose Institute and funding by the Florida Institute of Phosphate Research.
References
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Bungart, R., Huttl, R. F., 2001. Production of biomass for energy in post-mining landscapes and nutrient dynamics. Biomass and Bioenergy. 20, 3, pp. 181-187.
Joslin, J.D., Schoenholtz, S. H., 1997. Measuring the environmental effects of converting cropland to short-rotation woody crops: A research approach. Biomass and Bioenergy. 13, 4-5, pp. 301-311.
Labrecque, M., Teodorescu, T. I., Daigle, S., 1997. Biomass productivity and wood energy of Salix species after 2 years growth in SRIC fertilized with wastewater sludge. Biomass and Bioenergy. 12, 6, pp. 409-417.
Langholtz, M., Carter, D., Rockwood, D. L., Alavalapati, J., 2007. The economic feasibility of reclaiming phosphate mined lands with short-rotation woody crops in Florida. Journal of Forest Economics, 12, 237-249.
Langholtz, M., Carter, D. R., Rockwood, D. L., Alavalapati, J. R. R., Green, A., 2005. Effect of dendroremediation incentives on the profitability of short-rotation woody cropping of Eucalyptus grandis. Forest Policy and Economics. 7, 5, pp. 806-817.
Licht, L.A., Isebrands, J. G., 2005. Linking phytoremediated pollutant removal to biomass economic opportunities. Biomass and Bioenergy. 28, 2, pp. 203-218.
Medema, E.L., Lyon, G. W., 1985. The determination of financial rotation ages for coppicing tree species. Forest Science. 31, 2, pp. 398-404.
Mirck, J., Isebrands, J. G., Verwijst, T., Ledin, S., 2005. Development of short-rotation willow coppice systems for environmental purposes in Sweden. Biomass and Bioenergy. 28, 2, pp. 219-228.
Rockwood, D.L., Carter, D., Stricker, J. 2006. Commercial tree crops for phosphate mined lands, final report. Report Number FIPR Project Number: 99-03-141R. Florida Institute of Phosphate Research. Bartow, Florida.
Rockwood, D.L., Naidu, C., Segrest, S., Carter, D., Rahmani, M., Spriggs, T., Lin, C., Alker, G., Isebrands, J. G., 2004. Short-rotation woody crops and phytoremediation: Opportunities for agroforestry? In: Nair,P.K., Rao,M.R., Buck,L.E. (Eds.), New Vistas in Agroforestry, A Compendium for the 1st World Congress of Agroforestry 2004. Kluwer Academic Publishers, Dordrecht, The Netherlands, pp. 51-63.
Rosenqvist, H., Aronsson, P., Hasselgren, K., Perttu, K., 1997. Economics of using municipal wastewater irrigation of willow coppice crops. Biomass and Bioenergy. 12, 1, pp. 1-8.
Smart, J., Burgess, J., 2000. An environmental economic analysis of willow SRC production. Journal of Forest Economics. 6, 3, pp. 193-266.
Stricker, J., Prine, G., Anderson, D. L., Shibles, D. B., Riddle, T. C. 1993. Production and Managment of Biomass/Energy Crops on Phosphatic Clay in Central Florida. Report Number Circular 1084. 1-8. Florida Cooperative Extension Service.
Tait, D., 1986. A dynamic programming solution of financial rotation ages for coppicing tree species. Canadian Journal of Forest Research. 16, pp. 799-801.
Thornton, F.C., Joslin, J. D., Bock, B. R., Houston, A., Green, T. H., Schoenholtz, S., Pettry, D., Tyler, D. D., 1998. Environmental effects of growing woody crops on agricultural land: First year effects on erosion, and water quality. Biomass and Bioenergy. 15, 1, pp. 57-69.
Tolbert, V.R., Wright, L. L., 1998. Environmental enhancement of U.S. biomass crop technologies: research results to date. Biomass and Bioenergy. 15, 1, pp. 93-100.
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“If it's not grown, it's got to be mined,” Lenny the mine guide stated matter-of-factly as he led our hard hat-wearing group into the dim, damp underground Sierra Silver Mine in Wallace, Idaho. “If you really think about it, you'll realize how true that is,” he continued proudly. “The manufacture of everyday products requires silver, gold, copper, lead, zinc and other minerals.” Lenny is right.
Nicknamed “Smurf” by his former co-workers because of his short stature, the retired hard-rock-miner-turned-tour-guide entertained and educated us for about an hour as we toured the fascinating mine and learned its history. Through humorous yet true stories of his career as a miner, we were surprised to hear that the tools of the trade haven't changed much over the last 100 years. Long pneumatic drills are still used to bore holes into rock, and the holes are then filled with explosives. Although the noise during the drill demonstration was deafening, it lasted for just a few seconds, and it helped us to better understand the working conditions endured by hard rock miners. After Lenny's enjoyable and educational tour, our group re-boarded the vintage trolley that had brought us out to the mine, and listened to the driver as he pointed out local landmarks during the short and scenic ride back into downtown Wallace.
Wallace, Idaho, known officially as the Silver Capital of the World, is just one of 14 historic towns tucked into Idaho's Silver Valley. The Valley stretches about 40 miles, mostly along Interstate 90 between the Coeur d'Alene River and the Montana border, and got its name because the silver deposits first found here in the early 1880s were some of the richest ever discovered. The Valley's Coeur d'Alene Mining District is still one of the largest silver mining regions in the world, and has produced more than a billion ounces over the past century.
To get a real sense of 125 years of silver mining history, an underground tour of the Sierra Silver Mine can't be beat. It's fun and informative for the entire family, as is the Crystal Gold Mine tour in neighboring Kellogg, Idaho. And don't forget the outdoor gear when you visit—take full advantage of the Silver Valley's plentiful camping, fishing, and hiking opportunities.

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