You need to have an agreement with the contractor that he doesn't sell off the gold pieces you give him till the end of 7th day
Piece 1: $1000 (1st cut)
Piece 2: $2000 (2nd cut)
Remainder - P3: $4000
Day 1: P1
Day2: Take P1 back, Give P2
Day3: Give P1
Day4: Take P1+P2, Give P3
Day5: Give P1
Day6: Get P1 back Give P2
Day7: Give P1
Or you can sell the gold for $7,000 cash and then give him $1,000 each day.