Generally, the price of gold in Thailand will rise when the value of US dollar weakened because the value of US dollar is the medium of exchange in the world.
When the economy of america weakened, it makes Thai baht appreciate. For the impact of Thai baht appreciate, the reduced prices of import and transportation from foreign country but the price of exporting will increase.
Overall,Thailand will be adverse when Thai baht appreciate because the most revenue in Thailand come from export of agricultural goods.