Numbers can lie -- but they're the best first step in determining whether a stock is a buy. In this series, we use some carefully chosen metrics to size up a stock's true value based on the following clues:

  • The current price multiples.
  • The consistency of past earnings and cash flow.
  • How much growth we can expect.

Let's see what those numbers can tell us about how expensive or cheap Goldcorp (NYSE: GG) might be.

The current price multiples
First, we'll look at most investors' favorite metric: the P/E ratio. It divides the company's share price by its earnings per share -- the lower, the better.

Then, we'll take things up a notch with a more advanced metric: enterprise value to unlevered free cash flow. This divides the company's enterprise value (basically, its market cap plus its debt, minus its cash) by its unlevered free cash flow (its free cash flow, adding back the interest payments on its debt). Like the P/E, the lower this number is, the better.

Analysts argue about which is more important -- earnings or cash flow. Who cares? A good buy ideally has low multiples on both.

Goldcorp has a P/E ratio of 22.8 and an EV/FCF ratio of 51.2 over the trailing 12 months. If we stretch and compare current valuations to the five-year averages for earnings and free cash flow, Goldcorp has a P/E ratio of 33.7 and a five-year EV/FCF ratio of 479.9.

A positive one-year ratio under 10 for both metrics is ideal (at least in my opinion). For a five-year metric, under 20 is ideal.

Goldcorp is zero for four on hitting the ideal targets, but let's see how it compares against some competitors and industry mates. 

Company

1-Year P/E

1-Year EV/FCF

5-Year P/E

5-Year EV/FCF

Goldcorp 22.8 51.2 33.7 >100.0
Barrick Gold 11.4 >100.0 49.1 NM
Newmont Mining 13.9 24.3 37.1 63.9
Kinross Gold 21.6 >100.0 51.5 >100.0

Source: S&P Capital IQ; NM = not meaningful due to losses.

Numerically, we've seen how Goldcorp's valuation rates on both an absolute and relative basis. Next, let's examine...

The consistency of past earnings and cash flow
An ideal company will be consistently strong in its earnings and cash flow generation.

In the past five years, Goldcorp's net income margin has ranged from 13.4% to 48.7%. In that same time frame, unlevered free cash flow margin has ranged from -13.1% to 13.1%.

How do those figures compare with those of the company's peers? See for yourself:

Source: S&P Capital IQ; margin ranges are combined.

Additionally, over the last five years, Goldcorp has tallied up five years of positive earnings and two years of positive free cash flow.

Next, let's figure out...

How much growth we can expect
Analysts tend to comically overstate their five-year growth estimates. If you accept them at face value, you will overpay for stocks. But while you should definitely take the analysts' prognostications with a grain of salt, they can still provide a useful starting point when compared to similar numbers from a company's closest rivals.

Let's start by seeing what this company's done over the past five years. In that time period, Goldcorp has put up past EPS growth rates of 13.9%. Meanwhile, Wall Street's analysts expect future growth rates of 10%.

Here's how Goldcorp compares to its peers for trailing five-year growth (due to losses, Kinross' trailing growth rate isn't meaningful):

Source: S&P Capital IQ; EPS growth shown.

And here's how it measures up with regard to the growth analysts expect over the next five years:

Source: S&P Capital IQ; estimates for EPS growth.

The bottom line
The pile of numbers we've plowed through has shown us the price multiples shares of Goldcorp are trading at, the volatility of its operational performance, and what kind of growth profile it has -- both on an absolute and a relative basis.

The more consistent a company's performance has been and the more growth we can expect, the more we should be willing to pay. We've gone well beyond looking at a 22.8 P/E ratio, and we see that Goldcorp's free cash flows haven't kept up with its earnings. However, this is because of heavy capital expenditures. If this results in enough future growth, then this lag isn't a problem. Also, keep in mind that the free cash flows don't include cash acquisitions and divestitures.

Past growth has been good, but future growth will depend not only on the effectiveness of Goldcorp's spend but also on the price of commodities.

But these initial numbers are just a start. For more, check out Christopher Barker's list of his 10 favorite gold stocks for 2012. And if you find Goldcorp's numbers or story compelling, don't stop. Continue your due diligence process until you're confident one way or the other. As a start, add it to My Watchlist to find all of our Foolish analysis.

I wrote about a stock that's flying under the radar in our brand new free report: "The Stocks Only the Smartest Investors Are Buying." I invite you to take a free copy to find out the name of the company I believe Warren Buffett would be interested in if he could still invest in small companies.