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As further discussed in Note 18 , production at the Lucky Friday mine was temporarily suspended due to the requirement to remove built-up cementitious material from the Silver Shaft. As a result, during the first quarter of 2012, we liquidated forward contracts related to forecasted Lucky Friday base metal sales for total net proceeds of $3.1 million. 

Our concentrate sales are based on a provisional sales price containing an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from the sale of the concentrates at the forward price at the time of the sale. The embedded derivative, which does not qualify for hedge accounting, is adjusted to market through earnings each period prior to final settlement. 

## NoTE 11: BuSINESS SEgMENTS AND SIgNIFICANT CuSToMErS 

We discover, acquire, develop, produce, and market concentrates and doré containing silver, gold, lead and zinc. Our products consist of both metal concentrates, which we sell to custom smelters, and unrefined bullion bars (doré), which may be sold as doré or further refined before sale to precious metals traders. We are currently organized and managed by two segments, which represent our operating units: the Greens Creek unit and the Lucky Friday unit. 

General corporate activities not associated with operating units and their various exploration activities, as well as discontinued operations and idle properties, are presented as “other.” Interest expense, interest income and income taxes are considered general corporate items, and are not allocated to our segments. 

Sales of metal concentrates and metal products are made principally to custom smelters and metals traders. The percentage of sales contributed by each segment is reflected in the following table: 

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The tables below present information about reportable segments as of and for the years ended December 31, 2012, 2011 and 2010 (in thousands). 

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