[GRASS-user] Can I use r.mapcalc to create "sorted" elevation raster?

[Catlike]

Thank you for reading.
I am trying to use r.mapcalc, through QGIS, to take an elevations raster
with a wide variety of values and create a new elevations raster which only
contains those cells that have a value over a certain number (in this case,
300 meters). 
Unfortunately, the QGIS graphic user interface does not show me what the
actual command I create is. 
What I get when I run the command is a new raster in which every cell has
been converted to equal 300 meters! 
What should I do differently? 
Again, thank you.
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