When an individual is said to have da'as torah, is that the natural consequence of intense expertise or is it a God given supernatural gift bestowed on those deserving?

For example, it would be foolish to ignore the investment advice of a world class financial expert. This could be described with a term like "da'as finance". Is da'as torah simply the same concept as applied to Torah or is it a supernatural gift akin to prophecy?

Sources please.

[edit: To clear things up, I am defining da'as torah as the ability of sufficiently knowledgable Talmidei Chachamim to issue advice and/or rulings about issues which are not sourced in halchah. If you wish to use a different definition, that's fine but make that clear in your answer.]