Nov 14 (Reuters) - Peru's government said on Saturday it would quit an APEC summit in Singapore after recalling its envoy to Chile over charges a Peruvian military officer had spied for Chile's government. [nN14489069]

The charges that an air force official was in the pay of the Chilean government will further fuel tensions as an international court considers a Peruvian demand to claim more of territory disputed between them.

But the incident is just the latest chapter in a long dispute analysts agree is unlikely to spill over further or disrupt trade and investment between the South American neighbors, which are both key copper and metals exporters.

Here are some of the key facts about ties between the two, their history and trade relationship:

* Diplomatic ties between Peru and Chile have been periodically rattled since Chile defeated Peru in the 1879-1883 War of the Pacific and won a slice of mineral-rich land from its northern neighbor.

The border spat remains a source of tension. Peru filed suit against Chile last year at the International Court of Justice in The Hague, disputing their maritime border and demanding more of the rich Pacific Ocean fishing waters between them.

* But even in times of tension both countries are committed to free trade. Earlier this year a trade pact between the two countries went into effect, opening up their economies to each other as they sought to weather the global crisis.

Both countries rely heavily on revenues from mineral exports that have plunged during the world turmoil.

* In 2008, trade between the two countries reached $3.37 billion, a 24-percent increase over the year earlier, according to Chile. Chilean exports to Peru focused on the service sector, oil and fuel. Chile imports copper derivatives, fish oils and petroleum products.