Comparative value of steel

This is an attempt in putting a value in days worked on steel. The large amount of steel is for avoiding rounding off errors as all calculations are done with full days of work.

Best case scenario for 100000g steel (Every step is made with best tools, drills and quarries.)

104 days

• 54600g Iron
• 104 days
  • 72800g Iron ore
  • 70 days
    • 104250g Hematite
    • 28 days
  • 14560g Propane
  • 97 days
    • 19400g gas
    • 65 days
      • 4014g wood
      • 7 days
  • 145600g Limestone
  • 33 days
• 18200g Propane
• 122 days
  • 24400g gas
  • 82 days
    • 6710 wood
    • 12days
• 182000g Limestone
• 42 days

Sum --- 766 days;

One day of work is worth 130.5 grams of steel.

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Medium case for 100000g steel (Every step is made with no tools except the required ones.)

104 days

• 54600g Iron
• 104 days
  • 72800g Iron ore
  • 139 days
    • 104250g Hematite
    • 139 days
  • 14560g Propane
  • 97 days
    • 19400g gas
    • 194 days
      • 4014g wood
      • 14 days
  • 145600g Limestone
  • 133 days
• 18200g Propane
• 122 days
  • 24400g gas
  • 244 days
    • 6710 wood
    • 23days
• 182000g Limestone
• 166 days

Sum --- 1375 days;

One day of work is worth 72.7 grams of steel.

Note: I realize this doesn't include time and cost for trasport, tools and machinery.