The LTV is 60% for gold and 50% for silver.
Related articles:
What is the minimum amount for a Loan?
What is the length of time of the Loan?
Can I use the loan to buy more Gold & Silver?http://help.stackermarket.com/en/articles/5355847-can-i-use-the-loan-to-buy-more-gold-silver
What is the general interest rates of the loans?