METALS-Copper adds to losses after gloomy Fed minutes

GM lists prices for CNG vans

[AP] – General Motors said Tuesday that it will cost $15,910 for customers to outfit full-size Chevrolet Express and GMC Savana vans with compressed natural gas equipment.

Canadian Markets: Mining, materials buoy Canadian markets

[at MarketWatch] – Canadian markets manage to hold onto slight gains as consumer staples and energy stocks threaten to cancel out gains in the materials and mining sectors.

NYMEX-Crude ends down, posts biggest loss in 3 months

Today in Commodities: Another One Bites the Dust

Futures Movers: Crude falls below $72, down 8.9% in August

[at MarketWatch] – Crude futures finish month of August with a loss, their first monthly decline since May.

Spot Gold Prices Firm Up

[at TheStreet.com] – Spot gold prices were rising Tuesday afternoon as risk appetite fell along with the release of FOMC minutes from its August meeting that kept the key fed funds rate unaltered, and almost at zero.

Oil prices drop as economy still looks shaky

[AP] – Some of the economic news was a little better on Tuesday, but it was not enough to keep oil prices from dropping again. Benchmark crude for October delivery lost $2.78 to settle at $71.92 a barrel on the New York Mercantile Exchange.

As September Approaches, Commodity ETFs Appear Less Vulnerable

Metals Stocks: Gold, silver forge ahead, post solid monthly gains

[at MarketWatch] – Gold futures rise Tuesday, pushing August gains past 5%, and silver hits a three-month high as investors seek out both metals to protect against signs the economic recovery is faltering.