You can select all of them and send them to a mineral, and while they are all still grouped you hold shift, deselect one of them in the group of 4 you still have highlighted, let go of shift, (there should be 3 in the group now with the other you deselected heading towards the mineral you clicked earlier) and click another mineral, and repeat this process until all have been sent to minerals, it takes practice to be able to do this quickly so don’t be discouraged, and this is the method the person above me was also suggesting.

Another method is to highlight all of them, send them to a mineral patch, and while they are moving select one of them with your mouse, and send it to another mineral patch, and then select a different one and send that one to a different mineral patch, and finally select the 3rd one and send that one to a different mineral patch, you don’t need to worry about the 4th one because you already sent that with the 3 others to a patch in the beginning of this. This also takes practice so don’t be discouraged, and if you have any other questions regarding this feel free to ask!