Like pit said, you need to have a nice strong torch. T8000 works best. I use 2 torches, one in each hand, for the initial melt. Put one down from time to time to give the silver a swirling. Stirring it around helps spread the heat. Also, like pit said, get some fire bricks and build a cubby furnace with bricks on the sides, behind, and above your dish. Make sure to leave gaps in the back for proper ventilation. Also, use the smallest dish for the job. In other words, don't is a big 500 gram crucible for an ounce of silver. Patience is key, because sometimes it can seem like it takes a long time to melt, but will melt eventually. 2 torches helps greatly!!