Find the number of ores, which can be concentrated by the magnetic separation method. Galena, Copper pyrites, Haematite, Siderite

Haematite ore contains iron, which is separated from the impurities using a magnetic separation technique. In this technique, a magnet draws the ore particles to it, leaving behind undesirable non-magnetic impurities.
Magnetic separation can be used to separate iron ores such as haematite $\left({\mathrm{Fe}}_2{\mathrm{O}}_3\right)$, magnetite $\left({\mathrm{Fe}}_3{\mathrm{O}}_4\right)$, siderite $\left({\mathrm{FeCO}}_3\right)$, and iron pyrites $\left({\mathrm{FeS}}_2\right)$.