Oct 7 (Reuters) -Basis bids for soybeans and corn shipped by barge to the Gulf Coast were largely steady on Monday, traders said.

* CIF values had a softer tone due to ongoing U.S. corn and soy harvesting, a trader said. Harvest weather looks clear in the Midwest for the next seven to 10 days, he added.

* The soybean harvest is 47% complete, while 30% of the corn crop is harvested, the U.S. Department of Agriculture said.

* Traders are watching for potential demand from China, the world's biggest soybean importer, after the country's seven-day "Golden Week" holiday wrapped up on Monday.

* Exporters sold 172,500 metric tons of U.S. soybeans to unknown destinations and 155,000 metric tons of U.S. corn to Mexico, USDA said in its daily reporting system.

* CIF October soybean barges were bid at 74 cents over Chicago Board of Trade's November soybean SX24 futures, which was steady.

* FOB soy export premiums were flat for the first half of November at about 113 cents over futures. Last-half November offers were also steady at about 113 cents over futures.

* For corn, CIF barges loaded in October were bid 1 cent higher at 71 cents over CBOT December CZ24 futures.

* FOB Gulf corn export basis offers were steady at about 110 cents over futures for first-half November shipments. Offers were also unchanged at 110 cents over for shipments in the last half of November.

Reporting by Tom Polansek; Editing by Shreya Biswas

For displays of CIF basis, click on the codes in brackets: U.S. CIF Gulf soybeans GRYM U.S. CIF Gulf corn GRYN U.S. CIF Gulf SRW wheat GRYO U.S. CIF Gulf HRW wheat GRYP
For displays of FOB basis, please click on the following codes in brackets: U.S. FOB Gulf corn GRZC U.S. FOB Gulf soybeans GRZD U.S. FOB Gulf SRW wheat GRZE U.S. FOB Gulf HRW wheat GRZF LINKS Corn prices page: cpurl://apps.cp./cms/?pageid=corn-cash-market
Wheat prices page: cpurl://apps.cp./cms/?pageid=wheat-cash-market
U.S. barge freight BG/US
U.S. export sales estimates USDA/EST
U.S. grain export summary GRA/U
Brazil soybean export prices SYBS
Brazil corn export prices SYBX
Argentina grain prices GRA/ARG
Russia grain prices GRA/RU