I see your point. But I think you're wrong.
An
investment is a noun, referring to the thing. A thing cannot have intent. A investment thing is something that sits and accrues interest, hopefully.
I think you're thinking of
investing.
A verb, which would have your element of intent. An action you take with the intent of gaining profit, interest. Investing.
And no, stumbling on a gold mine is not an investment. But if you found that gold mine and sat on it, dumbly, for 10 years while it increased in value, it is an investment. IMHO.