partnering for the future 5. other current assets 6. property, plant and equipment, net Property, plant and equipment consist of the following: Other current assets consist of the following: prepaid commodity purchase contracts Prepaid commodity purchase contracts represent payments to producers in advance of delivery of the underlying commodities. Prepaid commodity purchase contracts are recorded at market. secured advances to suppliers Bunge provides cash advances to suppliers, which primarily include farmers of soy- beans and other agricultural commodities, to finance a portion  of the suppliers’ production cost. The advances are generally collateralized by physical assets of the supplier, carry a market interest rate and are repaid through the delivery of soybeans and other agricultural commodities. Secured advances to suppliers are stated at the original value of the advance plus accrued interest, less allowances for uncollectible advances. In addition to the current secured advances, Bunge has long-term secured advances to suppliers, primarily farmers, in the amount of  $198 million and $84 million at December 31, 2004 and 2003, respectively. The allowances for uncollectible advances totaled $43 million and $31 million at December 31, 2004 and 2003, respectively. marketable securities These securities are classified as trading securities and recorded at fair value based on quoted market prices. The related gains or losses are recognized in other income and (expense)—net in the consolidated statements of income. Bunge capitalized interest on construction in progress in the amount of $6 million, $8 million and $6 million in 2004, 2003 and 2002, respectively. Depreciation and depletion expense was $208 million, $182 million and $166 million in 2004, 2003 and 2002, respectively. 7. change in accounting principles Effective January 1, 2002, Bunge adopted SFAS No.142. SFAS No.142 supersedes APB Opinion No.17,  Intangible Assets, and changes the accounting for goodwill and other intangible assets with indefinite lives acquired individually or with a group of other assets, and those acquired in a business combination, by elimi- nating prospectively the amortization of all existing and newly acquired goodwill and other intangible assets with indefinite lives. SFAS No.142 requires goodwill and other intangible assets to be tested at least annually for impairment. Separable other intangible assets that are not deemed to have an indefinite life will continue to be amortized over their useful lives. The amorti- zation provisions of SFAS No.142 apply immediately to goodwill and intangible assets acquired after June 30, 2001. SFAS No.142 also requires that companies complete a transitional goodwill impairment test within six months from the date of adoption. In accordance with the transitional guidance and the adoption of SFAS No.142, Bunge completed a transitional impairment test computed based on a discounted cash flow and recorded a charge of $14 million, net of tax of $1 million as of January 1, 2002 for goodwill impairment losses. This impairment was related mainly to goodwill in the bakery mixes business line of its former wheat milling and bakery products segment. The goodwill impairment December 31, (US$ in millions) 2004 2003 Prepaid commodity purchase contracts $ 3 37 7 $ 247 Secured advances to suppliers 6 69 97 7 280 Unrealized gains on derivative contracts 3 31 10 0 418 Margin deposits 4 43 3 95 Recoverable taxes 1 13 38 8 70 Marketable securities 1 14 4 13 Other 3 33 38 8 351 Total $ $1 1,,5 57 77 7 $1,474 December 31, (US$ in millions) 2004 2003 Land $ 1 14 40 0 $ 114 Mining properties 2 20 06 6 136 Buildings 9 91 17 7 936 Machinery and equipment 2 2,,4 48 82 2 2,078 Furniture, fixtures and other 2 22 24 4 158 3 3,,9 96 69 9 3,422 Less: accumulated depreciation and depletion ((1 1,,8 81 10 0)) (1,556) Plus: construction in process 3 37 77 7 224 Total $ $ 2 2,,5 53 36 6 $ 2,090 63