Long-Life ReservesNarrow moat

The 'more than ten years of mine life' test in the Tier-One definition is not a formality; it is the whole game. A mine's reserve life is the number of years it can keep producing at the current rate before the economic ore runs out, and it is the single number that separates a durable asset from a short-dated bond that pays back in gold and then vanishes.

Barrick's flagships carry long lives — a decade or two of reserves at Nevada, Pueblo Viejo¹ (whose life was extended by a major expansion), Kibali, and Loulo-Gounkoto. Long life matters because building a mine costs billions and takes years; the longer you can run it afterward, the more of that fixed cost you spread and the more cash you harvest before you must spend again. A long-life, low-cost mine is a cash machine; a short-life one is a liability with a deadline.

But reserve life is a treadmill measured in years, not a permanent feature. It ticks down with every ounce mined and can only be held level by finding or buying more — and reserves reported at today's gold price can shrink if the price falls, because ore that is economic at $2,000 may not be at $1,200. So even a long life is a lease, not a freehold. It buys Barrick time and predictability that weaker miners lack, which is real and valuable — but it is time bought, not a moat owned.