Example Beancount Inventory File

onerun.beancount

option "operating_currency" "USD"
plugin "beancount.plugins.book_conversions" "Assets:Inventory:AU,Income:AU"
plugin "beancount.plugins.unrealized"

2016-01-08 open Assets:Cash     
2016-01-08 open Assets:Inventory:AU     
2016-01-08 open Income:USD     
2016-01-08 open Income:AU     
2016-01-08 open Expenses:USD     
2016-01-08 open Liabilities:Payroll     
2016-01-08 open Equity:Opening-Balances     

2016-03-08 commodity   AU
   export: "AU"
   name: "Gold"

2016-03-08 price AU 1000.00 USD

2016-02-01 * "Opening Equity"
  Assets:Cash   4000 USD
  Equity:Opening-Balances    -4000 USD
 
2016-03-08 * "Labor Made Gold"
  Assets:Inventory:AU  10.00 AU @ 100 USD
  Liabilities:Payroll      -1000 USD

2016-03-09 * "Labor Paid"
  Liabilities:Payroll      1000 USD
  Assets:Cash   -1000 USD

2016-04-08 price AU 500.00 USD

2016-04-08 * "Mining Sample"
  Assets:Inventory:AU  10.00 AU @ 250 USD
  Liabilities:Payroll      -2500 USD

2016-05-01 * "Sell some Gold"
  Assets:Inventory:AU -5 AU @ 600 USD
  Assets:Cash