Buried antipersonnel landmines are sometimes very difficult to find and that increases the risks to civilians and soldiers. Studies show that some specific soil properties and orientations of buried landmines which changes in time due to various soil processes make the operation of landmine detection really tricky. A study has been conducted to find how the GPR alerts changes with changes in soil surface and physical properties as well as the orientations and positions of two specific antipersonnel landmines which are hard to detect. The experiment also includes treatment combinations of grassland and bare soil to find the impact of variations in moisture, temperature and electrical conductivity of soil with and without grass cover and how it affect the reliability of GPR alerts. The study also comprises of treatments of three different orientations of two different antipersonnel landmines to find how the GPR alerts transform with alterations in positions of landmines which are already buried for long time. The results of the study are expected to be very much acceptable and useful during landmine detection and removal operation, and will also be helful to save thousands of lives.