Initial explorations of this site occurred in 1985, it focused on the model found.

Seismic exploration has occurred periodically since the 1960's.

These later explorations occurred amidst a global wave of research and development of the geothermal power.

Early exploration at the site occurred in the 1890s, when gold was discovered by William John Wilson in 1892.

The coal was first discovered in 1904, but the main exploration of its economic potential occurred in the 1980s to 1990s.

Mineral exploration has occurred on the slopes of almost all of the named mountains over time.

It is expected that manned exploration of the Moon and Mars will occur within the next two decades.

Typically the discussions follow a pre-designed questions so that deeper exploration can occur.

Little exploration, upgrading, or establishment of new fields occurred in 2005-6.

Initial exploration of this part of Central Asia occurred in the period 1774-1782.