--Increased mining costs have hurt earnings, raised doubts about profitability of some projects

--Higher costs are due to more expensive supplies, labor and appreciation of Peru's currency

--SNMPE president also urges caution with new consultation law

By Ryan Dube

LIMA, Peru--Peru's mining sector will likely continue to see rising costs, making it more expensive for companies to develop projects in the Andean country, the National Mining, Oil and Energy Society, or SNMPE, said Thursday.

Mining costs in Peru have increased steadily in recent years, which has recently affected the earnings of local companies and boosted the capital expenditures for some large-scale projects.

SNMPE President Eva Arias said in an interview that Peru's mining sector will need to become more efficient to cushion the impact of higher costs and to remain competitive compared with other mining districts. Peru is a major global producer of copper, gold, silver and other minerals.

The higher costs in the sector have been driven by more expensive supplies and labor, as well as the steady appreciation of Peru's currency against the U.S. dollar during the past decade. Many of Peru's biggest mining companies saw their net profits decline last year partially due to increased costs, while others have had to rethink their investment plans for large-scale projects.

Mining companies have lined up a pipeline of projects that will require investments worth some $53 billion this decade, according to industry and government figures. The government is counting on these projects in order to boost Peru's mineral production, which would increase tax collection, create more jobs and support economic growth.

But rising costs have already put into question the feasibility of some projects. In November last year, Gold Fields Ltd. (GFI, GFI.JO) and Compania de Minas Buenaventura SAA (BVN, BUENAVC1.VL) said the initial feasibility study to develop their Chucapaca gold deposit showed that the project wasn't viable due to high capital and operating costs. The companies are advancing a new feasibility study that could be completed by the end of this year.

Other companies have had to change their investment plans. In August, Xstrata PLC (XTA.LN) increased the capital expenditure on its Las Bambas copper project by 7% to $5.2 billion, while this year Chinese-owned Minera Chinalco Peru boosted its investment plan for the Toromocho project by 60% to $3.5 billion.

Ms. Arias said that investments for many other projects could also rise. "We have to try and be more efficient to reduce these costs and not lose our competitiveness," said Ms. Arias, a mining executive that was elected in February to lead the SNMPE until 2015.

Another major challenge for Peru's mining sector is opposition from rural communities that are worried about the environmental impact of new projects.

Ms. Arias said the government and industry need to do a better job of informing residents about the benefits of projects, while also implementing development works in remote communities that have high rates of poverty.

"I think this will help a lot to ease the social conflicts," she said.

The government has looked at several options to reduce disagreements. In 2011, President Ollanta approved legislation to ensure consultation with indigenous communities before the development of natural resource and infrastructure projects. At the time, the prior consultation law was seen as an important tool to resolve disputes by improving dialogue.

But many analysts now believe it could add more tension due to uncertainties over its implementation, including who should be consulted. Ms. Arias cautioned that the law could "paralyze" investments if it isn't properly implemented.

"If it isn't used well, it could be politicized and it could paralyze investments," Ms. Arias said. "We have to be very careful."

Write to Ryan Dube at ryan.dube@dowjones.com

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