Composition of siderite ore is

• Correct answer
  A

  $\mathrm{FeCO}_3$
• B

  $\mathrm{ZnCO}_3$
• C

  $\mathrm{CuCO}_3 \cdot \mathrm{Cu}(\mathrm{OH})_2$
• D

  $\mathrm{CuFeS}_2$

Hence, the correct answer is option: 'A'.