Lance:
In summary, there is a consensus that you are prepared to assume risk that is beyond reasonable, so allow me to expand.
1. As for borrowing, banks will only lend against existing production--not against proved reserves. Since you do not have production, and thus no assets to use a collateral, the odds of getting financing does not exist. Even the operating companies have limits on how much they can borrow against existing production--usually about 40% maximum. Therefore, even if you have production, you are looking at $400K loan maximum--so you still need $600K of your own money.
2. Have you seen the third-party engineering report that "proves" the reserves? Do not take any operator's word for it. Only a third party report should be used.
3. I do not think you completely understand the risks you are willing to take. Putting up $1.0 million is a lot of risk versus zero risk as a mineral (royalty) owner. Do you have the capital or ability to purchase insurance for well control or pollution? There is a long term contingent liability you will be assuming if you are a working interest owner, that is not assumed by a minerals owner.
4. There are a lot of wells in Weld County that, although economic, have never produced to forecast, and not all Hz wells are the same in spite of their "proved status". In some areas of Weld County they are drilling 14 Hz wells per section (6 Codell, 8 Niobrara). If you are buying only a "well bore interest", you interest is in one well bore in one formation. The operator can drill parallel wells that you would have no interest in unless you keep investing. What if a new well fracs into your well bore drainage area and decreases your production?
%. Can you afford to pay to re-drill the well if they lose the well bore? You do understand that you are responsible for your prorated share of the costs should their be a problem. (e.g. we had a tank battery hit by lightning. Our share of the costs to rebuild--$200,000. If the operator loses the well bore during drilling, what happens to your $1.0 million? Typically you lose it unless the re-drill is insured. )
5. Have you reviewed the JOA? Did you have an "oil and gas" attorney review it? This is complicated, and only an experienced O&G attorney should be used. Figure $400/hour if you can find one, as the good ones are not taking new clients.
Should you answer "I don't know" or "I'm not sure" then you have your answer.
Recommendation: negotiate your 3/16th's royalty interest and acreage bonus and just observe.
Wyo.