1st : you need to add icon as a container into your mine
2nd : You need a scale W and H :
scaleMapW : miniMap.Width / Layoutwidth
scaleMapH : miniMap.Height / LayoutHeight
3rd : For each icon on miniMap -> Set position
X : miniMap.X + mine.X * scaleMapW
Y : miniMap.Y + mine.Y * scaleMapH
Notice that the miniMap should set imagepoint is Top Left