(Recasts, adds details from nearest big mine)
LIMA, Sept 30 (Reuters) - A magnitude 5.9 quake struck southeastern Peru on Wednesday near Bolivia's capital of La Paz, but it was not felt by witnesses and mines in the area.
The U.S. Geological Survey initially reported a 6.3 magnitude quake but later downgraded it. The temblor was 100 miles (160 km) northwest of La Paz and fairly deep -- some 155.5 miles (250 km) below the surface.
An official at the nearest big Peruvian mine, Xstrata's <XTA.L> Tintaya, said the quake was not felt.
The temblor did not shake La Paz nor Peru's capital of Lima, people in those cities said.
There were no immediate reports of damages or casualties in Peru, a leading metals exporter.
(Reporting by Terry Wade in Lima, Editing by Sandra Maler)
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