Would you invest in this company?

My professor has asked us to see if this company is worth investing money in based on these numbers. Can you explain how to calculate if this company is worth investing in. It is a mining company:

Canyon Resources Simulation

Construction Starts in Year 2008
Years in Cash Flow 12
Capital Costs $250,000,000
Total Output (Oz) 4,900,000
Cash Operating Costs (Oz) $200
Gold Price $380
Debt Rate (%) 50.00%
Interest Rate 7.50%
Term (Yrs.) 8
Loan PMT $21,340,878
Inflation Rate 2.50%

State/Local Taxes (Oz) $17.00
Royalty Rate (%) 5.00%
Federal Tax Rate (%) 34.00%
Depletion Allowance 50.00%
After Tax Cost of Capital 17.50%
Pre-Tax Cost of Capital 26.52%

Net Present Value $14,481,692
Internal Rate of Return 20.41%
Pre-Tax Return 30.93%
Appraised Value $389,481,692

Revenue
2009 $155,166,667
2010 $155,166,667
2011 $155,166,667
2012 $155,166,667
2013 $155,166,667
2014 $155,166,667
2015 $155,166,667
2016 $155,166,667
2017 $155,166,667
2018 $155,166,667
2019 $155,166,667
2020 $155,166,667

Expenses
$81,666,667
$83,708,333
$85,801,042
$87,946,068
$90,144,719
$92,398,337
$94,708,296
$97,076,003
$99,502,903
$101,990,476
$104,540,238
$107,153,744

S&L Taxes
$6,941,667
$6,941,667
$6,941,667
$6,941,667
$6,941,667
$6,941,667
$6,941,667
$6,941,667
$6,941,667
$6,941,667
$6,941,667
$6,941,667

Royalty
$7,758,333
$7,758,333
$7,758,333
$7,758,333
$7,758,333
$7,758,333
$7,758,333
$7,758,333
$7,758,333
$7,758,333
$7,758,333
$7,758,333

Interest
$9,375,000
$8,477,559
$7,512,810
$6,475,705
$5,360,817
$4,162,313
$2,873,920
$1,488,898

Prin.
$11,965,878
$12,863,319
$13,828,068
$14,865,173
$15,980,061
$17,178,565
$18,466,958
$19,851,979

Yes, because the price of gold surpased $800/oz today, and is still rising. Based on these numbers, this is a cash cow investment, with rising revenues with the rising price of gold.

But what you professor wants is the answer according to the accounting principles he has taught you.

No because revenue is not increasing year after year and it is likely the cost of doing business will continue to rise hence this is a poor investment.