Philippines officials project that mining companies will pump almost $15 billion into the country's hard-pressed economy over the next few years, but not everyone is pleased.

Leftist and indigenous groups protested with placards outside a mining conference in Manila Thursday, complaining that many will be marginalized by the rapid increase in mining activity.

Activist Rene Pamplona says the culture and traditions of indigenous communities will be destroyed and farmers will see their fields destroyed.

Gerald Brimo, the president of Nickel Asia Corporation, insists that is not the case. He says the mining industry has demonstrated its commitment to the environment over the years.

Environment Secretary Ramon Paje said at the conference Wednesday that his government will support the industry's expansion, but will not tolerate shady dealings or procedures that dirty the environment.

The government projects that mining investment will reach $18 billion by 2016, up from $3.8 billion over the past six years. Officials credit the increased activity to rising commodity prices and an easing of restrictions on mining permits.

The Philippines has vast untapped reserves of minerals, including gold, copper and nickel. But public opinion has held back exploitation of the resources after a series of damaging accidents.