Silver traded in London dropped on Monday trading session reaching the weakest level in five weeks, while other precious metals slightly advanced on mine strikes in South Africa and concerns about supplies from Russia. Silver for delivery in March lost 0.7% to $20.198 an ounce, whereas Platinum jumped 0.1% to $1,436.25 an ounce and palladium climbed 0.4% to $797.75 an ounce.