If an account can no longer support the positions it holds it will be automatically liquidated by Gemini. The liquidation process is designed to provide an orderly unwind of leveraged positions that no longer have the capital required to support them.

Liquidation is triggered when the Margin Assets Value of the account falls below the Margin Maintenance Limit.

The liquidation process is as follows:

• Cancel all existing open orders. If this means that the Margin Assets Value is greater than the Margin Maintenance Limit then the liquidation process will stop.
• An Immediate-Or-Cancel order will be sent at the Zero Price for 50% of the position size will be sent on behalf of the account in liquidation. If the position size is smaller than $10,000 notional then 100% of the position size will be sent. If the execution of this order results in the Margin Assets Value being greater than the Margin Maintenance Limit then the liquidation process will stop.
• The process will continue to send orders until the Margin Assets Value is greater than the Margin Maintenance Limit or until the entire position has been closed. 

Should the execution of the liquidation orders occur at a price better than the Zero Price then the improvement is kept by the account. Any liquidation orders that are executed will be charged the Liquidation Fee of 0.5%, no other trading fees are charged.

The liquidation orders are sent to the order book for that instrument in order to be liquidated. If this is not possible due to a lack of liquidity at the desired price then the positions are passed to the Gemini Insurance Fund at the Zero Price. If, for any reason, the Insurance Fund is unable to accept the orders, then the exchange will run an auto-deleveraging process. 

Please refer to this article for more information on the cross-collateral liquidation process.