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الأحد، 20 نوفمبر 2016

Travaux souterrains



Travaux souterrains


TEChnIquES DEl’IngÉnIEuR
l’expertise technique et scientifique de référence
c5565 
Travaux souterrains 

Date de publication : 10/11/1994
:Par
Pierre GESTA 
Ingénieur de l'École Centrale de Paris, Ancien Directeur à la SOGEA, Président du Comité technique de
(l'Association Française des Travaux en Souterrains (AFTES




السبت، 5 نوفمبر 2016

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السبت، 20 أغسطس 2016

Caterpillar Plans to Sell Underground-Mining Equipment Lines

Caterpillar Plans to Sell Underground-Mining Equipment Lines

Caterpillar Inc. is retreating from the slumping coal industry, saying it plans to put its equipment lines for underground mines up for sale and lay off workers.

The Peoria, Ill., company said Thursday it will cut the workforce at its Houston, Pa., plant by about 155 jobs and will consider closing the plant if a buyer can’t be found. The plant produces a variety of coal-harvesting equipment and hauling vehicles and gear used in underground mines.

About 40 jobs also will be cut from a mining-equipment plant in Denison, Texas, where drills are made for underground mines. Caterpillar said it will stop taking orders for the for coal-mining equipment made at the Houston and Denison plants but will continue to support equipment already in use.

Demand for coal in the U.S. has fallen sharply in recent years as stricter environmental standards and low prices for natural gas make coal less attractive to burn in domestic power-generating plants. Caterpillar acquired the underground equipment lines as part of its $8 billion-plus purchase in 2011 of mining equipment company Bucyrus International.

“Caterpillar remains committed to an extensive mining-product portfolio,” said Denise Johnson, president of the mining-equipment business. “We firmly believe mining is an attractive long-term industry. At the same time, we continue to manage through the longest down-cycle in our history.”

Caterpillar is expected to log its fourth-straight year of lower sales in 2016. The mining-equipment business has been among the company’s weakest units recently amid slumping prices for mined commodities and reduced investments in mine expansions and new equipment. Caterpillar’s mining unit lost $163 million in the second quarter as sales dropped 29% during the quarter from a year earlier.

Caterpillar also announced it will revamp its plant in Winston-Salem, N.C. The plant has been producing powertrain components for giant trucks used in surface mines. But slumping demand for the trucks has left the Winston-Salem plant, as well as a plant in Decatur, Ill., where the trucks are assembled, severely underused in recent years.

The company said it will move the component assembly work to Decatur and repurpose the Winston-Salem plant for warehousing, machining or fabrication operations for its railroad-equipment business, Progress Rail. The Winston-Salem plant was opened in 2011 as part of a push by Caterpillar to expand production capacity, particularly for big mining trucks. But demand for the trucks began dropping shortly after the plant opened.

الجمعة، 1 يوليو 2016

Newmont Mining Selling Indonasian Mine for $1.3 Billion

An aerial view of Bitu Hijau Open pit Copper and Gold mine.

U.S. gold producer Newmont Mining Corp. said Thursday that it would sell its 48.5% economic interest in the operator of the Batu Hijau copper and gold mine in Indonesia to local company PT Amman Mineral Internasional for $1.3 billion.

The announcement came as Indonesian-listed oil and gas company PT Medco Energi Internasional Tbk said it had acquired a controlling stake in PT Amman for $2.6 billion.

A group of Indonesian investors led by Medco had earlier expressed interest in purchasing as much as 76% of the mine operator, PT Newmont Nusa Tenggara. Medco said Thursday that it would join forces with an investment firm led by banker Agus Projosasmito and receive funding for the purchase from Indonesia’s three largest state-owned banks.

Japan’s Sumitomo Corp., Newmont’s partner in Newmont Nusa Tenggara, has also agreed to sell its ownership stake to PT Amman.

Newmont said the sale of its stake at “fair value aligned with its strategic priorities to lower debt, fund highest margin projects and create value for shareholders.”

“Our goal is to build a portfolio of long-life, low-cost assets with the technical, social and political risks we are well-equipped to manage,” Newmont Chief Executive Gary Goldberg said in a conference call to discuss the transaction, noting that earlier divestments have lowered risk.

The sale will involve a closing payment of $920 million and contingent payments of up to $403 million, Newmont said. Globally, Newmont has gained $1.9 billion from sales of noncore assets since 2013.

The latest deal, which is expected to close in the third quarter, comes as miners world-wide are re-evaluating their assets, having been hit by a slump in commodities prices. In early June, mining giant BHP Billiton Ltd. agreed to sell its 75% interest in Indonesia’s IndoMet Coal to local producer PT Alam Tri Abadi, in a move to pursue other growth options that BHP said were more attractive for future investment.

Colorado-based Newmont and Sumitomo operate the Batu Hijau copper and gold mine on the island of Sumbawa in Western Indonesia.

The mine—one of Indonesia’s largest copper deposits—has been a largely profitable venture for Newmont since it started commercial operations there in 2000.

Keeping production up, however, will require a hefty investment in the next phase of development at a time when Newmont has been hit by increasingly burdensome regulation and uncertainty about the future of its operating contract.

Jorge Beristain, a metals and mining analyst at Deutsche Bank, estimated that around $1.6 billion is needed for the next stage of expansion.

The company said its debt burden would “improve significantly” without Batu Hijau.

Some analysts had earlier said Newmont’s efforts to sell off its stake also suggests concerns about the long-term outlook for the Indonesian mining industry.

Vast deposits of copper, nickel and coal have lured foreign miners to Indonesia for decades and mining has contributed greatly to economic growth in the country. But growing nationalism and the desire among some officials to grab back control of the country’s natural resources has raised risks.

Rules issued in recent years have pushed foreign miners to divest majority stakes, pay higher taxes and royalties and invest in processing unrefined ores. By law, miners are also required to eventually shift from long-term contracts of work to a licensing system. Analysts and miners say the rules make little sense at a time when miners globally are re-evaluating their investments and Indonesia is trying to draw in more foreign capital.


After the rule banning the export of unrefined ores took effect, Newmont ceased exports and later declared force majeure on existing contracts. To receive an export permit—a biannual process—the U.S. Company has had to show it is making progress on refining or stop its shipments. Delays in shipments in 2015 caused Newmont’s fourth-quarter revenue to fall 10% from a year earlier.

الجمعة، 3 يونيو 2016

Volcano Eruption in Papua New Guinea



Volcano Eruption in Papua New Guinea

الثلاثاء، 31 مايو 2016

Relative age dating (very difficult)

Relative age dating (difficult)

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