Afghan mining road show set for London on June 25

* 200 companies expected at London meeting

* India, China seen as most interested

* Lithium shows big promise, says expert

By Sue Pleming

WASHINGTON, June 16 (Reuters) - Afghanistan will promote its mining wealth at a "road show" in London on June 25, aiming to boost interest in its major iron ore deposit and other minerals, Kabul's envoy to Washington said on Wednesday.

Ambassador Said Jawad said about 200 companies were expected to attend the London meeting where the Afghan Mines Ministry will give details of a tender due to be relaunched later this year for the Hajigak iron ore deposit west of Kabul and to drum up foreign interest in the nascent mining sector.

"We are asking for investment in our country to develop these resources so we cannot be a burden on the world," said Jawad, speaking to Reuters on the sidelines of an event to announce a water study of Kabul by the U.S. Geological Survey (USGS).

"Investing in Afghanistan (the mining sector) is part of investing in global security," he added.

Afghanistan has huge untapped mineral reserves, from gems, copper and iron ore to gold, lithium and rare elements.