You can find all projects on Bitcoin forum. But the saddest thing is that most of the mining projects are scammed. It is more likely that your money will be stolen, So I think before you invest in mining projects, you must take a good look at the projects.
Taking a good look, means what? Going to the mining farm? You may or may not be able to confirm the existence of such mining farms and datacenters. That does not mean that the mining operation is legit. The only legit form of mining is mining on your own. There have been projects that has raised money through ICOs in order to include token holders in the investment scheme like Ice Rock Mining, Ambit Mining, Envion and many more. Each one of them has ended up as a failure. Ambit disappeared without a trace, IRM team has gone AWOL without dividends, Envion founders are fighting a court case for 2+ years against a hostile takeover.
How long has the project been on the market?
Genesis mining was there was years. The evidence for it being an MLM is much more now.
How many people are working on the project?
You will never get an answer to this question as an investor.
How much mining dividend has the project paid so far?
When a ponzi runs, they spend the new investors money to pay the old investors, so for the investors coming in they are getting dividends, did that mean that the project is legitimate? No. Therefore giving dividends is not equal to legitimacy.