Plug for a void, system and method

A method for forming a plug in a void of a mine comprising the steps of:

• placing a plurality of pipes throughout the void;
• adding a catalyst to a single component material;
• providing the single component material with the catalyst to a pump which pumps only the single component material with the catalyst;
• supplying air to the pump at a minimum of 90 psi while the pump is pumping the single component material with the catalyst through a first hose attached to a first port of a y fitting;
• supplying water at a minimum of 60 psi through a second hose to a second port of the y fitting so the water and single component material with the catalyst merge in the y fitting to create a product, the catalyst used being a function of ambient temperature about the void and a temperature of the water;
• and
• placing the product with a third hose that extends from the y fitting on outer most areas of the void and moving the product to a middle of the void, where the product expands when the product releases into the void from the third hose and cures to a rigid closed cell foam to form a plug in the void, wherein the placing the product step includes the steps of connecting the third hose to a first pipe of the plurality of pipes and flowing the product to the first pipe so the product flows out of the first pipe into the void, after which the product foams and hardens, the third hose having a mixing stick across which the product flows into the first pipe.