Level pending

I have an small ball of gold. When I was carrying it for home I accidentally put it in a bag with 15 other balls of the same size and the same color. To discover the true golden ball I have only one pan balance. What is the smallest number of weighings necessary to guarantee that I can separate the true golden ball from the others?

1. The golden ball is heavier than the others.
2. All the others balls have the same weight


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