------
## 最终结论
```python
def position_min(lst):
    min_value = min(lst)
    positions = []
    for index, value in enumerate(lst):
        if value == min_value:
            positions.append(index)
    return positions

# Test cases
assert position_min([12,33,23,10,67,89,45,667,23,12,11,10,54]) == [3,11]
assert position_min([1,2,2,2,4,4,4,5,5,5,5]) == [0]
assert position_min([2,1,5,6,8,3,4,9,10,11,8,12]) == [1]
```