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We introduce a novel method to measure the masses of galaxy clusters at highredshift selected from optical and IR Spitzer data via the red-sequencetechnique. Lyman-break galaxies are used as a well understood, high-redshiftbackground sample allowing mass measurements of lenses at unprecedented highredshifts using weak lensing magnification. By stacking a significant number ofclusters at different redshifts with average masses of ~1-3x10^14M_sun, asestimated from their richness, we can calibrate the normalisation of themass-richness relation. With the current data set (area: 6 deg^2) we detect amagnification signal at the >3-sigma level. There is good agreement between themasses estimated from the richness of the clusters and the average massesestimated from magnification, albeit with large uncertainties. We perform teststhat suggest the absence of strong systematic effects and support therobustness of the measurement. This method - when applied to larger data setsin the future - will yield an accurate calibration of the mass-observablerelations at z>~1 which will represent an invaluable input for cosmologicalstudies using the galaxy cluster mass function and astrophysical studies ofcluster formation. Furthermore this method will probably be the least expensiveway to measure masses of large numbers of z>1 clusters detected in futureIR-imaging surveys.

Lensing Magnification: A novel method to weigh high-redshift clusters and its application to SpARCS