The weekly deposit bonus increases each week of the month up to a maximum bonus of 160%! A Breakdown of the Weekly Deposit Bonuses It’s our way of saying “thank you” for playing, and hopefully something to look forward to. How it works is simple: with each passing week in the month, we are going to increase your deposit bonus by 20%. Silver Oak Casino members receive great bonuses all throughout the year, but why stop there? Weekly bonuses were the natural progression in the ongoing quest to provide a superior online gaming experience.