Operating Data. Following is summary consolidated operating data for the North America copper mines for the fourth quarters and years ended 2012 and 2011:
|Three Months Ended||Years Ended|
|December 31,||December 31,|
|Copper (millions of recoverable pounds)|
|Sales, excluding purchases||321||333||1,351||1,247|
|Average realized price per pound||$||3.63||$||3.44||$||3.64||$||3.99|
|Molybdenum (millions of recoverable pounds)|
|Unit net cash costs per pound of copper:|
|Site production and delivery, excluding adjustments||$||2.00||$||1.73||$||1.91||$||1.78|
|By-product credits, primarily molybdenum b||(0.35||)||(0.37||)||(0.36||)||(0.48||)|
|Unit net cash costs c||$||1.78||$||1.48||$||1.67||$||1.41|
a. Reflects molybdenum production from certain of the North America copper mines. Sales of molybdenum are reflected in the Molybdenum division (refer to page 9).
b. Molybdenum credits reflect volumes produced at market-based pricing.
c. For a reconciliation of unit net cash costs per pound to production and delivery costs applicable to sales reported in FCX's consolidated financial statements, refer to the supplemental schedule, “Product Revenues and Production Costs,” beginning on page VII, which is also available on FCX's website, “ www.fcx.com .”Consolidated copper sales volumes from North America of 321 million pounds in fourth-quarter 2012 were lower than fourth-quarter 2011 sales of 333 million pounds primarily reflecting timing of shipments.